{"title":"Grain Spawn","description":"\u003cp\u003eGrain spawn is the bridge between your culture and your fruiting substrate. Whether you are inoculating a jar with a liquid culture syringe, mixing colonized spawn into a monotub, or producing your own grain from raw materials, the quality of your grain determines how fast colonization runs and how well your final flush turns out.\u003c\/p\u003e\n\n\u003cp\u003eEvery spawn bag and jar in this collection is \u003cstrong\u003emade fresh daily, in-house at Midwest Grow Kits\u003c\/strong\u003e. We soak our grain overnight, simmer and dry it for perfect hydration, then pressure-sterilize for \u003cstrong\u003e3 hours in our autoclaves\u003c\/strong\u003e. Bags are \u003cstrong\u003eUnicorn 10T spawn bags\u003c\/strong\u003e with a \u003cstrong\u003e0.22 micron filter patch\u003c\/strong\u003e, 3-mil construction, and a self-healing injection port. The result: grain ready to colonize fast, cleanly, and consistently.\u003c\/p\u003e\n\n\u003cp\u003eOur top seller is the \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\/products\/premium-5-grain-spawn-bags\"\u003ePremium 5-Grain Spawn Bag\u003c\/a\u003e, a 2-quart bag (2.25 to 2.5 lbs) blending rye berries, white and red milo, and white and red millet for the fastest possible colonization.\u003c\/p\u003e","products":[{"product_id":"the-original-rye-spawn-bags","title":"The Original Rye Spawn Bags","description":"\u003cp\u003e\u003cstrong\u003eThe Original Rye Grain Spawn Bags (2-Pack)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSterile Rye Berry Grain Spawn Bags for Reliable Mushroom Cultivation\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eTrusted since the 1970s, our \u003cstrong\u003eOriginal Rye Grain Spawn Bags\u003c\/strong\u003e are a classic choice for growers who want reliable, nutrient-rich grain spawn for mushroom cultivation. These \u003cstrong\u003esterile mushroom spawn bags\u003c\/strong\u003e are loaded with over 2 quarts of organic rye berries per bag—hydrated, pH-balanced, fortified with essential minerals, and professionally sterilized for clean inoculation.\u003c\/p\u003e\n\n\u003cp\u003eRye grain is one of the most widely used grains for mushroom spawn because it offers excellent moisture balance, consistent kernel size, and strong nutrient density. These \u003cstrong\u003erye berry grain spawn bags\u003c\/strong\u003e are ideal for colonizing with liquid culture or spores, then mixing into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e or using with \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotub setups\u003c\/a\u003e for larger bulk grows.\u003c\/p\u003e\n\n\u003cp\u003eOur sterile rye spawn bags are soaked overnight, simmered, sealed, and pressure sterilized for 3 hours in our autoclave so they arrive ready for inoculation.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHow to Inoculate \u0026amp; Colonize Rye Grain Spawn Bags\u003c\/h2\u003e\n\u003cp\u003eThese sterilized grain bags are designed for simple, contamination-resistant inoculation using liquid culture or spore syringes. Each bag features a self-healing injection port and 0.22-micron filter patch for proper gas exchange during colonization.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/i.ibb.co\/DHX6McsD\/Spawn-Bag-steps-web.jpg\" alt=\"How to inoculate sterile rye grain spawn bags showing colonization stages\" style=\"max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\n\u003cp\u003eAfter inoculation, incubate the bags in a clean, warm environment and allow the mycelium to fully colonize the rye grain. Once dense white growth is achieved, the spawn is ready for bulk substrate, monotub growing, or other fruiting setups.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBreaking Up Rye Spawn for Bulk Mushroom Grows\u003c\/h2\u003e\n\u003cp\u003eWhen fully colonized, rye grain spawn can be easily broken up and mixed into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e such as coco coir, manure-based blends, or Master’s Mix. This makes rye spawn ideal for \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e, grow bins, and high-yield bulk cultivation methods.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/i.ibb.co\/MkvSX3mW\/steps-bulk-grow.jpg\" alt=\"Breaking up colonized rye grain spawn and mixing into bulk substrate in a monotub\" style=\"max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\n\u003cp\u003eRye kernels separate cleanly and distribute evenly throughout the substrate, helping create multiple strong inoculation points for faster colonization and more uniform pin sets.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 Original Rye Grain Spawn Bags\u003c\/strong\u003e (2.25–2.5 lbs each)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCereal-grade organic rye berries\u003c\/strong\u003e, mineral water, gypsum, and nutrient-enhancing herbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-healing high-temperature injection ports\u003c\/strong\u003e for sterile inoculation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3mm polypropylene bags\u003c\/strong\u003e with 0.22-micron filter patches for optimal gas exchange\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eStep-by-step photo guide + instructional videos\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose Our Rye Grain Spawn Bags?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClassic Rye Berry Performance\u003c\/strong\u003e\u003cbr\u003eRye berries provide excellent moisture balance, nutrient density, and consistent grain structure for reliable colonization.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSterile \u0026amp; Ready to Use\u003c\/strong\u003e\u003cbr\u003eEach bag is soaked, simmered, sealed, and pressure sterilized in-house so it arrives ready for clean inoculation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Bulk \u0026amp; Monotub Growing\u003c\/strong\u003e\u003cbr\u003eRye spawn breaks apart cleanly and mixes evenly into substrate for monotubs, grow bins, and bulk growing methods.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStrong Second and Third Flush Potential\u003c\/strong\u003e\u003cbr\u003eThe nutrient-rich rye grain base supports vigorous mycelium growth and strong performance through later flushes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContamination-Resistant Design\u003c\/strong\u003e\u003cbr\u003eFilter patches and high-mounted injection ports help reduce handling errors and support healthy gas exchange.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePro Tips for Best Results\u003c\/h2\u003e\n\u003cp\u003eUsing sterile technique, inject \u003cstrong\u003e5–7 cc\u003c\/strong\u003e of liquid culture or spores directly into the injection port. Keep the bag in a clean, warm area around \u003cstrong\u003e72–76°F\u003c\/strong\u003e during colonization. Once initial mycelium growth is established, gently mix or massage the grain when appropriate to speed up grain-to-grain spread.\u003c\/p\u003e\n\n\u003cp\u003eOnce fully colonized, break up the rye spawn and transfer it into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e for maximum yields. These rye spawn bags pair perfectly with \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e, bulk substrate blocks, and high-humidity fruiting environments.\u003c\/p\u003e\n\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003eNew to Grain Spawn?\u003c\/h3\u003e\n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003eLearn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\u003c\/p\u003e\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e Read the Full Guide → \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide for rye grain spawn bags\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978225377429,"sku":"rbags01","price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Original_Rye_Spawn_Bags_Main.jpg?v=1778154823"},{"product_id":"premium-5-grain-spawn-bags","title":"Premium 5-Grain Spawn Bags | Sterile Grain Bags for Mushroom Cultivation","description":"\u003cp\u003e\u003cstrong\u003ePremium 5-Grain Spawn Bags (2-Pack)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSterile Grain Bags • Fast Colonization • Built for Bulk Mushroom Grows\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eOur \u003cstrong\u003ePremium 5-Grain Mushroom Spawn Bags\u003c\/strong\u003e have been a customer favorite for over a decade because they combine the speed of a finely balanced grain blend with the long-term performance growers need for reliable \u003cstrong\u003emushroom cultivation\u003c\/strong\u003e. These \u003cstrong\u003esterile grain bags\u003c\/strong\u003e are professionally prepared for clean inoculation and strong mycelium growth, making them ideal for beginners and experienced growers alike.\u003c\/p\u003e\n\n\u003cp\u003eEach bag contains our proprietary five-grain blend, fortified hydration, and a mineral-rich Calcium+ mix—professionally sterilized, sealed, and ready for effortless inoculation with liquid culture or spore solution. Whether you’re running a single tub or scaling up your routine, these \u003cstrong\u003emushroom spawn bags for sale\u003c\/strong\u003e are built for vigorous colonization, dependable performance, and excellent results when mixed into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e or used with \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs and accessories\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eHow to Inoculate \u0026amp; Colonize 5-Grain Spawn Bags\u003c\/h2\u003e\n\u003cp\u003eThese 5-grain spawn bags are designed for simple, contamination-resistant inoculation using liquid culture or spore syringes. Each bag includes a \u003cstrong\u003eself-healing injection port\u003c\/strong\u003e and a \u003cstrong\u003e0.22-micron filter patch\u003c\/strong\u003e to support proper gas exchange during colonization.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/i.ibb.co\/DHX6McsD\/Spawn-Bag-steps-web.jpg\" alt=\"How to inoculate sterile 5-grain spawn bags for mushroom cultivation step by step\" style=\"max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\n\u003cp\u003eAfter inoculation, incubate the bag in a clean, warm environment and allow the mycelium to fully colonize the grain blend. Once you see dense, uniform white growth throughout the bag, your \u003cstrong\u003esterile grain spawn\u003c\/strong\u003e is ready for fruiting prep or transfer into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBreaking Up Spawn \u0026amp; Mixing into Bulk Substrate\u003c\/h2\u003e\n\u003cp\u003eOne of the biggest advantages of a multi-grain blend is how evenly it distributes through substrate. Once fully colonized, break up the spawn and mix it into bulk substrate such as coco coir blends, manure-based substrates, or other bulk grow mixes for \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e, grow bins, and larger fruiting setups.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/i.ibb.co\/MkvSX3mW\/steps-bulk-grow.jpg\" alt=\"Breaking up colonized mushroom grain spawn and mixing into bulk substrate for monotub growing\" style=\"max-width: 100%; height: auto;\"\u003e\u003c\/p\u003e\n\n\u003cp\u003eThe varied grain sizes help create \u003cstrong\u003emore colonization points\u003c\/strong\u003e throughout the substrate—often resulting in faster substrate takeover, more even pinsets, and improved canopy potential. For growers planning bulk grows, pairing these spawn bags with quality \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e can help streamline the process from colonization to fruiting.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2 × 5-Grain Spawn Bags\u003c\/strong\u003e (2.25–2.5 lbs each, ~2 quarts)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10T 3mm polypropylene bags\u003c\/strong\u003e with 0.22-micron filter patch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-temp self-healing injection port\u003c\/strong\u003e for easy spore or liquid culture inoculation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStep-by-step photo grow guide\u003c\/strong\u003e + advanced bulk grow instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Growers Choose Our Sterile Grain Bags\u003c\/h2\u003e\n\u003cp\u003eOur proprietary blend starts with \u003cstrong\u003erye berries\u003c\/strong\u003e and is enhanced with a curated combination of grains such as \u003cstrong\u003ered sorghum, white sorghum, millet\u003c\/strong\u003e, and complementary grains selected to improve inoculation speed, grain-to-substrate distribution, and nutrient balance. This makes these bags an excellent choice for growers looking for dependable \u003cstrong\u003emushroom grain\u003c\/strong\u003e for monotubs, bulk grows, and other cultivation setups.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum surface area\u003c\/strong\u003e – more inoculation points can mean faster colonization\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced nutrient profile\u003c\/strong\u003e – supports vigorous growth and strong multi-flush performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow clumping \/ better break-up\u003c\/strong\u003e – grains are soaked, simmered, and dried to reduce sticking\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFortified hydration\u003c\/strong\u003e – blended RO + mineral water, gypsum, Calcium+, and DAP to support balanced pH and nutrient availability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExcellent for bulk growing\u003c\/strong\u003e – mixes evenly into substrate for monotubs and larger fruiting setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eSterility \u0026amp; Quality Control\u003c\/h2\u003e\n\u003cp\u003eEvery batch is produced for consistency and reliability. Each run is autoclaved at \u003cstrong\u003e18 PSI for 180 minutes\u003c\/strong\u003e to ensure thorough sterilization while reducing handling variables. Bags are sealed, inspected, and packed to arrive clean, dependable, and ready to use.\u003c\/p\u003e\n\n\u003cp\u003eFor best results, inject \u003cstrong\u003e5–7 cc\u003c\/strong\u003e of liquid culture or spores through the injection port, then incubate until fully colonized. Once colonized, break up the grain and transfer it into \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e for high-yield grows in \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e or other bulk fruiting chambers.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePerformance Highlights\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10+ years\u003c\/strong\u003e of proven grower success\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast colonization\u003c\/strong\u003e and strong, even mycelium spread\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExcellent bulk performance\u003c\/strong\u003e for monotubs and grow bins\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eCompatible with a wide range of gourmet and research strains\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for beginners\u003c\/strong\u003e while still preferred by experienced bulk growers\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePro Tips for Faster Colonization\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eAfter inoculation, keep the bag warm (72–76°F) and undisturbed until you see clear mycelium growth.\u003c\/li\u003e\n  \u003cli\u003eOnce colonization begins and the bag reaches around 25–30%, gently mix or massage the grains when appropriate to speed up spread.\u003c\/li\u003e\n  \u003cli\u003eUse clean technique when inoculating—wipe the injection port, use a sterile needle, and minimize exposure.\u003c\/li\u003e\n  \u003cli\u003eFor bulk grows, fully colonized grain spawn typically performs best when mixed evenly throughout your substrate.\u003c\/li\u003e\n  \u003cli\u003ePair with quality \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate mixes\u003c\/a\u003e and the right \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotub setup\u003c\/a\u003e for the best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e \u003c\/p\u003e\n\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n\n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide for mushroom cultivation\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978225705109,"sku":"5grn01","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/New_5_grain_spawn_Bags_Main.jpg?v=1778154234"},{"product_id":"24-oz-premium-super-quick-colonizing-5-grain-jar","title":"24 oz Premium Super Quick-Colonizing 5-grain Jar","description":"\u003cstyle\u003e\n@keyframes fadeInSoft {\n  from { opacity: 0; transform: translateY(10px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.fade-in-media {\n  animation: fadeInSoft 1.2s ease-out forwards;\n  opacity: 0;\n}\n.spec-table,\n.usage-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 18px 0 24px 0;\n  font-size: 15px;\n}\n.spec-table th,\n.spec-table td,\n.usage-table th,\n.usage-table td {\n  border: 1px solid #e5e5e5;\n  padding: 10px 12px;\n  text-align: left;\n  vertical-align: top;\n}\n.spec-table th,\n.usage-table th {\n  background: #f7f7f7;\n}\n.info-callout {\n  background: #f8fafc;\n  border: 1px solid #e5e7eb;\n  border-radius: 8px;\n  padding: 16px 18px;\n  margin: 20px 0;\n}\n\u003c\/style\u003e\n\n\u003cp\u003e\u003cstrong\u003e24oz Premium Super Quick Colonizing 5-Grain Spawn Jar\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLightning-Fast Colonization • Tapered Glass Design • Sterile Grain Spawn\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003c!-- Timeline Image --\u003e\n\u003cdiv style=\"text-align:center; margin: 18px 0 28px 0;\" class=\"fade-in-media\"\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/24oz_5grain_Jars_timeline.jpg?v=1773500920\" alt=\"24oz super quick colonizing 5-grain spawn jar colonization timeline\" style=\"max-width:100%; height:auto; border-radius:10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits 24oz Super Quick Colonizing 5-Grain Spawn Jar\u003c\/strong\u003e is engineered for growers who want faster colonization and easier spawn handling. This sterile grain jar uses a high-performance 5-grain blend combined with a tapered glass jar design that allows the fully colonized grain mass to slide out more easily when it’s time to spawn to bulk substrate.\u003c\/p\u003e\n\n\u003cp\u003eCompared to traditional 32oz jars, the smaller 24oz size often allows for \u003cstrong\u003efaster colonization times\u003c\/strong\u003e, while the specialized grain blend creates more inoculation points for aggressive mycelium growth.\u003c\/p\u003e\n\n\u003cdiv class=\"info-callout\"\u003e\n\u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eWhy growers love these jars:\u003c\/strong\u003e The smaller jar size helps speed up colonization, while the tapered glass design makes removing the colonized spawn easier when transferring to bulk substrate, monotubs, or grow bags.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose the 24oz Super Quick Colonizing Jar?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFaster Than Larger Grain Jars\u003c\/strong\u003e – Smaller jar size supports quicker colonization cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered Glass Jar Design\u003c\/strong\u003e – Allows the colonized grain to slide out more easily once fully grown.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Colonization Grain Blend\u003c\/strong\u003e – High ratio of smaller grains increases inoculation points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Easy Inoculation\u003c\/strong\u003e – Self-healing injection port works with spores or liquid culture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Gas Exchange\u003c\/strong\u003e – Premium 0.22 micron filter disk maintains airflow while protecting sterility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreat for Bulk Growing\u003c\/strong\u003e – Ideal for monotubs, trays, casing mix, and bulk substrate expansion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eOne (1) 24oz Tapered Glass Grain Spawn Jar\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Quick Colonizing 5-Grain Blend\u003c\/strong\u003e featuring:\n  \u003cul\u003e\n    \u003cli\u003eNutrient-enriched rye berries\u003c\/li\u003e\n    \u003cli\u003eHigh ratio of smaller grains for faster colonization\u003c\/li\u003e\n    \u003cli\u003eMineral water fortified with gypsum and diammonium phosphate\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.22 Micron Filter Disk\u003c\/strong\u003e for sterile gas exchange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Healing Injection Port\u003c\/strong\u003e for clean inoculation\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePressure Sterilized at 15 PSI for 120 Minutes\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\n\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eJar Size\u003c\/td\u003e\n\u003ctd\u003e24oz Tapered Glass Jar\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003eSingle Jar\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eGrain Blend\u003c\/td\u003e\n\u003ctd\u003eQuick colonizing 5-grain blend with nutrient enriched rye berries\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAdditives\u003c\/td\u003e\n\u003ctd\u003eGypsum and diammonium phosphate mineral mix\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003e0.22 micron filter disk\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eInjection Port\u003c\/td\u003e\n\u003ctd\u003eSelf-healing port for spores or liquid culture\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSterilization\u003c\/td\u003e\n\u003ctd\u003e15 PSI for 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eAverage Colonization Time\u003c\/td\u003e\n\u003ctd\u003e14–20 days under proper conditions\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eRecommended Inoculation\u003c\/td\u003e\n\u003ctd\u003e3–4cc spores or liquid culture\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Usage Chart\u003c\/h2\u003e\n\n\u003ctable class=\"usage-table\"\u003e\n\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eRecommended Amount\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eSpore Syringe\u003c\/td\u003e\n\u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n\u003ctd\u003eInject through the self-healing port\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eLiquid Culture\u003c\/td\u003e\n\u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n\u003ctd\u003eOften produces faster colonization\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eBulk Substrate Ratio\u003c\/td\u003e\n\u003ctd\u003e2–3 jars per 5 lbs substrate\u003c\/td\u003e\n\u003ctd\u003eRecommended for monotub grows\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\u003ctd\u003eBest Use Case\u003c\/td\u003e\n\u003ctd\u003eMonotubs, trays, grow bags\u003c\/td\u003e\n\u003ctd\u003eIdeal for bulk substrate expansion\u003c\/td\u003e\n\u003c\/tr\u003e\n\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eBuilt for Speed and Easy Spawn Transfer\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003e24oz Super Quick Colonizing 5-Grain Spawn Jar\u003c\/strong\u003e was developed for growers who want both faster colonization and easier spawn handling. The smaller jar size allows quicker growth while the tapered design helps the finished grain spawn slide out more cleanly when it’s time to mix with bulk substrate.\u003c\/p\u003e\n\n\u003cp\u003eThis makes the jar especially useful for growers using \u003cstrong\u003emonotub systems, bulk substrate grows, and casing mix\u003c\/strong\u003e where quick colonization and easy jar handling can help improve workflow and consistency.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFast Colonizing Grain Spawn for Mushroom Cultivation\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits 24oz Super Quick Colonizing 5-Grain Jar\u003c\/strong\u003e provides a sterile, ready-to-use spawn option designed for fast colonization and easy transfer into bulk substrate. If you want a grain jar that moves quickly and simplifies spawn transfer, this is one of the most efficient options available.\u003c\/p\u003e\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n      \n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978230227093,"sku":"PQC7","price":7.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/5grain_24oz_single.jpg?v=1745528324"},{"product_id":"3-pack-premium-24-oz-super-quick-colonizing-5-grain-jar-24oz","title":"3-Pack Premium 24 Oz Super-Quick-Colonizing 5-grain Jar (24oz)","description":"\u003cstyle\u003e\n@keyframes fadeInSoft {\n  from { opacity: 0; transform: translateY(10px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.fade-in-media {\n  animation: fadeInSoft 1.2s ease-out forwards;\n  opacity: 0;\n}\n.spec-table,\n.usage-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 18px 0 24px 0;\n  font-size: 15px;\n}\n.spec-table th,\n.spec-table td,\n.usage-table th,\n.usage-table td {\n  border: 1px solid #e5e5e5;\n  padding: 10px 12px;\n  text-align: left;\n  vertical-align: top;\n}\n.spec-table th,\n.usage-table th {\n  background: #f7f7f7;\n}\n.info-callout {\n  background: #f8fafc;\n  border: 1px solid #e5e7eb;\n  border-radius: 8px;\n  padding: 16px 18px;\n  margin: 20px 0;\n}\n\u003c\/style\u003e\n\u003cp\u003e\u003cstrong\u003e3-Pack Premium 24oz Super Quick Colonizing 5-Grain Jars\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLightning-Fast Colonization, Tapered Jar Design \u0026amp; Sterile Grain Spawn for Easy Bulk Growing\u003c\/strong\u003e\u003c\/p\u003e\n\u003c!-- Top Colonization Timeline Image --\u003e\n\u003cdiv class=\"fade-in-media\" style=\"text-align: center; margin: 18px 0 28px 0;\"\u003e\u003cimg style=\"max-width: 100%; height: auto; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\" alt=\"24oz 5-grain spawn jar colonization timeline showing fast mushroom grain jar colonization progress\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/24oz_5grain_Jars_timeline.jpg?v=1773500920\"\u003e\u003c\/div\u003e\n\u003cp\u003eGrow faster with \u003cstrong\u003eMidwest Grow Kits 3-Pack Premium 24oz Super Quick Colonizing 5-Grain Jars\u003c\/strong\u003e. These custom \u003cstrong\u003e24oz tapered glass grain spawn jars\u003c\/strong\u003e are built for growers who want rapid colonization, easy inoculation, and a jar design that makes colonized grain easier to remove when it is ready for bulk substrate or other expansion.\u003c\/p\u003e\n\u003cp\u003eCompared to standard 32oz jars, these 24oz jars are known for \u003cstrong\u003efaster average colonization times\u003c\/strong\u003e thanks to their smaller size, efficient grain mass, and optimized 5-grain blend. The custom tapered shape also helps the colonized jar contents slide out more easily once fully grown, making transfer cleaner and more convenient.\u003c\/p\u003e\n\u003cdiv class=\"info-callout\"\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eWhy growers love these jars:\u003c\/strong\u003e They colonize faster than larger 32oz jars, use a high-performance 5-grain blend, and feature a tapered glass design that helps the finished colonized cake slide out with less effort when it is time to spawn to bulk.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose Our 24oz Super Quick Colonizing Jars?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThe Fastest Grain Spawn Product We Sell\u003c\/strong\u003e – Unique jar shape and size helps support quicker average colonization times.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered Glass Design\u003c\/strong\u003e – Makes it easier to slide the fully colonized grain mass out of the jar.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRapid Colonization Blend\u003c\/strong\u003e – High ratio of smaller grains helps create more inoculation points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Easy Inoculation\u003c\/strong\u003e – Self-healing injection port works with spores or liquid culture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable Gas Exchange\u003c\/strong\u003e – Premium 0.22 micron filter disk supports airflow while helping maintain sterility.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGreat for Bulk Growing\u003c\/strong\u003e – Ideal for monotubs, trays, casing mix, and bulk substrate expansion.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eThree (3) 24oz Tapered Glass Grain Spawn Jars\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium 5-Grain Blend\u003c\/strong\u003e featuring:\n\u003cul\u003e\n\u003cli\u003eNutrient-enriched rye berries\u003c\/li\u003e\n\u003cli\u003eA high ratio of smaller grains for fast colonization\u003c\/li\u003e\n\u003cli\u003eSpecial mineral water mix fortified with gypsum and diammonium phosphate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0.22 Micron Filter Disk\u003c\/strong\u003e for sterile gas exchange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-Healing Injection Port\u003c\/strong\u003e for clean inoculation\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePressure Sterilized at 15 PSI for 120 Minutes\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eJar Size\u003c\/td\u003e\n\u003ctd\u003e24oz Tapered Glass Jars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e3 Jars Per Pack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGrain Blend\u003c\/td\u003e\n\u003ctd\u003ePremium quick-colonizing 5-grain blend with nutrient-enriched rye berries and a high ratio of smaller grains\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdditives\u003c\/td\u003e\n\u003ctd\u003eGypsum and diammonium phosphate in a mineral water blend\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFilter Type\u003c\/td\u003e\n\u003ctd\u003e0.22 micron filter disk\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInjection Port\u003c\/td\u003e\n\u003ctd\u003eSelf-healing port for spores or liquid culture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterilization\u003c\/td\u003e\n\u003ctd\u003e15 PSI for 120 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Colonization Time\u003c\/td\u003e\n\u003ctd\u003eApproximately 14–20 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended Inoculation\u003c\/td\u003e\n\u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eRecommended Usage Chart\u003c\/h2\u003e\n\u003cp\u003eUse this quick chart as a general guide when planning your grow.\u003c\/p\u003e\n\u003ctable class=\"usage-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003cth\u003eRecommended Amount\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSpore Syringe per Jar\u003c\/td\u003e\n\u003ctd\u003e3–4cc\u003c\/td\u003e\n\u003ctd\u003eInject through the self-healing port for clean inoculation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLiquid Culture per Jar\u003c\/td\u003e\n\u003ctd\u003e4-6cc\u003c\/td\u003e\n\u003ctd\u003eGreat choice for very fast colonization when using clean culture\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBulk Substrate Ratio\u003c\/td\u003e\n\u003ctd\u003e2–3 jars per 5 lbs of bulk casing mix\u003c\/td\u003e\n\u003ctd\u003eRecommended for monotub and bulk substrate grows\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAverage Colonization Window\u003c\/td\u003e\n\u003ctd\u003e14–20 days\u003c\/td\u003e\n\u003ctd\u003eOften faster than standard 32oz grain jars\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eDesigned for Speed and Easy Transfer\u003c\/h2\u003e\n\u003cp\u003eThese jars are built for growers who want both speed and convenience. The smaller 24oz size can colonize more quickly than larger jar formats, while the tapered glass shape makes it easier to remove the finished colonized grain when it is time to break it up or spawn it to bulk substrate.\u003c\/p\u003e\n\u003cp\u003eThat makes these jars an excellent option for growers using \u003cstrong\u003ebulk casing mix\u003c\/strong\u003e, \u003cstrong\u003emonotubs\u003c\/strong\u003e, and other bulk fruiting setups where fast turnaround and easy jar handling can improve the overall workflow.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003ePremium 24oz Grain Spawn Jars for Faster Mushroom Cultivation\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits 3-Pack Premium 24oz Super Quick Colonizing 5-Grain Jars\u003c\/strong\u003e gives growers a sterile, ready-to-use grain spawn option designed for fast colonization, easy inoculation, and simpler transfer into bulk substrate. If you want a jar that moves quickly and is easier to empty once colonized, this is one of the best options in the lineup.\u003c\/p\u003e\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n      \n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978232717461,"sku":"PQC3","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/3_pack_24oz_jars.jpg?v=1745528388"},{"product_id":"3-pack-premium-quick-colonizing-5-grain-jar-32oz","title":"3-Pack Premium Quick-Colonizing 5-grain Jar (32oz)","description":"\u003cstyle\u003e\n@keyframes fadeInSoft {\n  from { opacity: 0; transform: translateY(10px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.fade-in-media {\n  animation: fadeInSoft 1.2s ease-out forwards;\n  opacity: 0;\n}\n.spec-table,\n.usage-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 18px 0 24px 0;\n  font-size: 15px;\n}\n.spec-table th,\n.spec-table td,\n.usage-table th,\n.usage-table td {\n  border: 1px solid #e5e5e5;\n  padding: 10px 12px;\n  text-align: left;\n  vertical-align: top;\n}\n.spec-table th,\n.usage-table th {\n  background: #f7f7f7;\n}\n.info-callout {\n  background: #f8fafc;\n  border: 1px solid #e5e7eb;\n  border-radius: 8px;\n  padding: 16px 18px;\n  margin: 20px 0;\n}\n\u003c\/style\u003e\n\n\u003cp\u003e\u003cstrong\u003e3-Pack Premium Quick-Colonizing 5-Grain Spawn Jars (32oz Wide Mouth)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSterile Grain Spawn Jars for Fast Colonization, Easy Inoculation \u0026amp; Bulk Growing\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003c!-- Top Colonization Timeline Image --\u003e\n\u003cdiv class=\"fade-in-media\" style=\"text-align: center; margin: 18px 0 28px 0;\"\u003e\n  \u003cimg style=\"max-width: 100%; height: auto; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\" alt=\"5-grain spawn jar colonization timeline showing mushroom grain jar progress from inoculation to full colonization\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/5grain_jar_timeline_1K_16_9_low.jpg?v=1773499008\"\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eGet faster, more reliable growth with \u003cstrong\u003eMidwest Grow Kits Premium 5-Grain Spawn Jars\u003c\/strong\u003e. This 3-pack of \u003cstrong\u003e32oz wide mouth sterile grain jars\u003c\/strong\u003e is designed for growers who want dependable colonization, easy inoculation, and strong performance for \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e, \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e, and other mushroom cultivation projects.\u003c\/p\u003e\n\n\u003cp\u003eEach jar is filled with a carefully balanced \u003cstrong\u003e5-grain mushroom spawn blend\u003c\/strong\u003e made from rye berries, white milo, red milo, white millet, and red millet. This mix provides a range of grain sizes that creates more inoculation points, helping support rapid mycelium spread and more aggressive colonization compared to single-grain jars or larger bulk containers.\u003c\/p\u003e\n\n\u003cdiv class=\"info-callout\"\u003e\n  \u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eWhy growers like 5-grain jars:\u003c\/strong\u003e Grain spawn jars can be more reliable and faster colonizing for beginners because the smaller grain volume is easy to monitor, easy to shake, and often colonizes quickly with less guesswork.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose Our 5-Grain Spawn Jars?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Colonization Potential\u003c\/strong\u003e – Multiple grain sizes create more inoculation points for strong, even growth.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBeginner-Friendly\u003c\/strong\u003e – Grain jars are easy to monitor and often more reliable for first-time growers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Easy Inoculation\u003c\/strong\u003e – Self-healing injection port makes spore syringe or liquid culture use simple.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Gas Exchange\u003c\/strong\u003e – Each lid includes a 0.22 micron filter disk for healthy airflow.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSterile \u0026amp; Ready to Use\u003c\/strong\u003e – Professionally sterilized and prepared for immediate inoculation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Bulk Growing\u003c\/strong\u003e – Ideal for mixing with casing mix or bulk substrate in monotubs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eThree (3) 32oz Wide Mouth Glass Spawn Jars\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium 5-Grain Blend\u003c\/strong\u003e made with:\n    \u003cul\u003e\n      \u003cli\u003eRye berries\u003c\/li\u003e\n      \u003cli\u003eWhite milo\u003c\/li\u003e\n      \u003cli\u003eRed milo\u003c\/li\u003e\n      \u003cli\u003eWhite millet\u003c\/li\u003e\n      \u003cli\u003eRed millet\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGypsum \u0026amp; Calcium Phosphate\u003c\/strong\u003e for improved grain performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0.22 Micron Filter Disk\u003c\/strong\u003e for gas exchange\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-Healing Injection Port\u003c\/strong\u003e for clean inoculation\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eSterilized at 15 PSI for 120 Minutes\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eComponent\u003c\/th\u003e\n      \u003cth\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJar Size\u003c\/td\u003e\n      \u003ctd\u003e32oz Wide Mouth Glass Jars\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePack Size\u003c\/td\u003e\n      \u003ctd\u003e3 Jars Per Pack\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGrain Blend\u003c\/td\u003e\n      \u003ctd\u003eRye berries, white milo, red milo, white millet, red millet\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAdditives\u003c\/td\u003e\n      \u003ctd\u003eGypsum and calcium phosphate\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFilter Type\u003c\/td\u003e\n      \u003ctd\u003e0.22 micron filter disk\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInjection Port\u003c\/td\u003e\n      \u003ctd\u003eSelf-healing port for spores or liquid culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSterilization\u003c\/td\u003e\n      \u003ctd\u003e15 PSI for 120 minutes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRecommended Inoculation\u003c\/td\u003e\n      \u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Usage Chart\u003c\/h2\u003e\n\u003cp\u003eUse this quick chart as a general guide when planning your bulk grow.\u003c\/p\u003e\n\u003ctable class=\"usage-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eApplication\u003c\/th\u003e\n      \u003cth\u003eRecommended Amount\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSpore Syringe per Jar\u003c\/td\u003e\n      \u003ctd\u003e3–4cc\u003c\/td\u003e\n      \u003ctd\u003eInject through the self-healing port for clean inoculation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLiquid Culture per Jar\u003c\/td\u003e\n      \u003ctd\u003e5–7cc\u003c\/td\u003e\n      \u003ctd\u003eIdeal for faster colonization when using clean culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBulk Substrate Ratio\u003c\/td\u003e\n      \u003ctd\u003e1–2 jars per 5 lbs of casing mix\u003c\/td\u003e\n      \u003ctd\u003eRecommended for monotub and \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e grows\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBest Use Case\u003c\/td\u003e\n      \u003ctd\u003eMonotubs, trays, bulk grows\u003c\/td\u003e\n      \u003ctd\u003eExcellent for expanding colonized grain into larger fruiting setups\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDesigned for Faster Colonization\u003c\/h2\u003e\n\u003cp\u003eUnlike single-grain jars, this premium blend combines both larger and smaller grains to help distribute inoculant more effectively and support faster colonization throughout the jar. The result is a vigorous \u003cstrong\u003egrain spawn jar\u003c\/strong\u003e that is easy to shake, easy to expand, and ideal for growers who want dependable performance.\u003c\/p\u003e\n\n\u003cp\u003eThese \u003cstrong\u003emushroom grain jars\u003c\/strong\u003e are especially well-suited for growers moving into \u003cstrong\u003ebulk substrate cultivation\u003c\/strong\u003e and \u003cstrong\u003emonotub growing\u003c\/strong\u003e, where strong grain spawn can make a major difference in colonization speed and overall success. If you prefer larger-scale inoculation, you can also explore our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003espawn bags collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrom Jar to Bulk Monotub Grow\u003c\/h2\u003e\n\u003cp\u003eThe video below shows the process of inoculating a grain jar, allowing it to colonize, breaking it up, and mixing it with substrate for a bulk monotub grow.\u003c\/p\u003e\n\n\u003cdiv class=\"fade-in-media\" style=\"max-width: 760px; margin: 25px auto 10px auto;\"\u003e\n  \u003cdiv style=\"position: relative; overflow: hidden; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n    \u003cdiv style=\"padding: 56.25% 0 0 0; position: relative;\"\u003e\n      \u003ciframe style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\" title=\"5-Grain Spawn Jar to Bulk Monotub Grow Video\" src=\"https:\/\/player.vimeo.com\/video\/1173563699\"\u003e\u003c\/iframe\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePremium Grain Spawn Jars for Mushroom Cultivation\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits 3-Pack Premium 5-Grain Spawn Jars\u003c\/strong\u003e gives growers a sterile, ready-to-use grain spawn option built for fast colonization and strong expansion into bulk substrate. Whether you are inoculating with spores or liquid culture, these jars are designed to simplify the process and improve consistency from start to finish.\u003c\/p\u003e\n\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978238648469,"sku":"PQC9","price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/5grain_jar_new_32oz_white_background.jpg?v=1770810052"},{"product_id":"bulk-red-millet-grain","title":"Bulk Red Millet Grain","description":"\u003cp\u003e\u003cstrong\u003eBulk Red Proso Millet Grain (40 Pounds) – Premium Dry Mushroom Spawn Substrate\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNutrient-Dense | Low Contamination Risk | Ideal for Inoculation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eEnhance your mushroom spawn production with our \u003cstrong\u003eBulk Red Millet Grain\u003c\/strong\u003e, trusted by cultivators for its low endospore load and nutrient-rich profile. Sourced from local Midwest farmers committed to sustainable practices, this premium red millet provides the ideal foundation for reliable colonization across a variety of mushroom species.\u003c\/p\u003e\n\u003cp\u003eThanks to its small grain size, red millet allows for more inoculation points per volume, promoting faster colonization and better distribution of mycelium. It’s naturally high in protein, fiber, vitamins, and minerals, making it a superior choice for both beginner and professional growers.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e    \u003cstrong\u003e40 lb bag\u003c\/strong\u003e of dry, untreated red millet\u003c\/li\u003e\n\u003cli\u003e    Sourced from local, sustainable Midwest farms\u003c\/li\u003e\n\u003cli\u003e    High-nutrient content supports healthy mycelium growth\u003c\/li\u003e\n\u003cli\u003e    Low endospore contamination risk\u003c\/li\u003e\n\u003cli\u003e    Perfect for use with jars, spawn bags, and bulk substrates\u003c\/li\u003e\n\u003cli\u003e    Suitable for a wide range of mushroom species\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you’re looking for a consistent, high-performing grain for your mycology projects, this Bulk Red Millet is a dependable and efficient choice.\u003c\/p\u003e","brand":"Myco Labs","offers":[{"title":"Default Title","offer_id":45978239008917,"sku":"RMM40","price":44.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/White_millet_40lb_Bag.jpg?v=1757418776"},{"product_id":"3-pack-organic-rye-grain-jars-32oz","title":"3-Pack Original Rye Grain Jars (32oz)","description":"\u003cstyle\u003e\n@keyframes fadeInSoft {\n  from { opacity: 0; transform: translateY(10px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.fade-in-media {\n  animation: fadeInSoft 1.2s ease-out forwards;\n  opacity: 0;\n}\n.spec-table,\n.usage-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 18px 0 24px 0;\n  font-size: 15px;\n}\n.spec-table th,\n.spec-table td,\n.usage-table th,\n.usage-table td {\n  border: 1px solid #e5e5e5;\n  padding: 10px 12px;\n  text-align: left;\n  vertical-align: top;\n}\n.spec-table th,\n.usage-table th {\n  background: #f7f7f7;\n}\n.info-callout {\n  background: #f8fafc;\n  border: 1px solid #e5e7eb;\n  border-radius: 8px;\n  padding: 16px 18px;\n  margin: 20px 0;\n}\n\u003c\/style\u003e\n\n\u003cp\u003e\u003cstrong\u003e3-Pack Original Rye Grain Spawn Jars (32oz Wide Mouth)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSterile Rye Berry Mushroom Spawn Jars for Easy Inoculation, Reliable Colonization \u0026amp; Bulk Growing\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003c!-- Top Colonization Timeline Image --\u003e\n\u003cdiv style=\"text-align:center; margin: 18px 0 28px 0;\" class=\"fade-in-media\"\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Rye_Berry_Jars_timeline.jpg?v=1773500296\" alt=\"rye berry spawn jar colonization timeline showing mushroom grain jar progress from inoculation to full colonization\" style=\"max-width:100%; height:auto; border-radius:10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eStart your grow with one of the most trusted grain spawn options in mushroom cultivation. The \u003cstrong\u003eMidwest Grow Kits 3-Pack Original Rye Grain Spawn Jars\u003c\/strong\u003e includes three \u003cstrong\u003e32oz wide mouth sterilized rye berry jars\u003c\/strong\u003e prepared for clean inoculation, dependable colonization, and easy expansion into bulk substrate, monotubs, grow bags, or additional grain spawn.\u003c\/p\u003e\n\n\u003cp\u003eEach jar is filled with properly hydrated \u003cstrong\u003epremium rye grain\u003c\/strong\u003e, a classic choice for mushroom spawn thanks to its moisture retention, nutrient profile, and grain size. Rye berry spawn jars are widely used by growers who want a reliable, easy-to-work-with substrate for spores or liquid culture.\u003c\/p\u003e\n\n\u003cdiv class=\"info-callout\"\u003e\n  \u003cp style=\"margin:0;\"\u003e\u003cstrong\u003eWhy growers like rye grain jars:\u003c\/strong\u003e Rye berries offer an excellent balance of moisture, nutrition, and grain structure, making them a dependable choice for clean colonization, shake recovery, and expansion into larger bulk growing projects.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose Our Rye Grain Spawn Jars?\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Colonization\u003c\/strong\u003e – Premium rye grain offers a proven environment for healthy mycelium growth.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Easy Inoculation\u003c\/strong\u003e – Self-healing injection ports make spores and liquid culture simple to use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDependable Gas Exchange\u003c\/strong\u003e – Each lid includes a 0.22 micron filter patch for airflow while helping resist contamination.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSterile \u0026amp; Ready to Use\u003c\/strong\u003e – Professionally prepared and sterilized for immediate inoculation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Bulk Growing\u003c\/strong\u003e – Excellent for spawning to casing mix, bulk substrate, monotubs, and grow bags.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBeginner Friendly\u003c\/strong\u003e – A simple and dependable way to begin with grain spawn jars.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eThree (3) 32oz Wide Mouth Glass Rye Grain Spawn Jars\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003ePremium Hydrated Rye Grain\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0.22 Micron Filter Patch\u003c\/strong\u003e for gas exchange\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-Healing Injection Port\u003c\/strong\u003e for clean inoculation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfessionally Sterilized Grain Spawn Jars\u003c\/strong\u003e ready for spores or liquid culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\n\u003ctable class=\"spec-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eComponent\u003c\/th\u003e\n      \u003cth\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJar Size\u003c\/td\u003e\n      \u003ctd\u003e32oz Wide Mouth Glass Jars\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePack Size\u003c\/td\u003e\n      \u003ctd\u003e3 Jars Per Pack\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGrain Type\u003c\/td\u003e\n      \u003ctd\u003ePremium hydrated rye berries\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFilter Type\u003c\/td\u003e\n      \u003ctd\u003e0.22 micron filter patch\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInjection Port\u003c\/td\u003e\n      \u003ctd\u003eSelf-healing port for spores or liquid culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePreparation\u003c\/td\u003e\n      \u003ctd\u003eProfessionally hydrated and sterilized\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRecommended Inoculation\u003c\/td\u003e\n      \u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eUse Case\u003c\/td\u003e\n      \u003ctd\u003eSpawn production, monotubs, grow bags, grain expansion, bulk substrate cultivation\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Usage Chart\u003c\/h2\u003e\n\n\u003cp\u003eUse this quick chart as a general guide when planning your bulk grow.\u003c\/p\u003e\n\n\u003ctable class=\"usage-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eApplication\u003c\/th\u003e\n      \u003cth\u003eRecommended Amount\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSpore Syringe per Jar\u003c\/td\u003e\n      \u003ctd\u003e3–4cc\u003c\/td\u003e\n      \u003ctd\u003eInject through the self-healing port for clean inoculation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLiquid Culture per Jar\u003c\/td\u003e\n      \u003ctd\u003e3–4cc\u003c\/td\u003e\n      \u003ctd\u003eWorks well for faster colonization when using clean culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBulk Substrate Ratio\u003c\/td\u003e\n      \u003ctd\u003e2 jars per 5 lbs of casing mix\u003c\/td\u003e\n      \u003ctd\u003eRecommended for monotub and bulk substrate grows\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBest Use Case\u003c\/td\u003e\n      \u003ctd\u003eMonotubs, grow bags, trays, bulk grows\u003c\/td\u003e\n      \u003ctd\u003eExcellent for expanding colonized grain into larger fruiting setups\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Rye Grain Still Matters\u003c\/h2\u003e\n\n\u003cp\u003eRye berries remain one of the most popular grain spawn choices for a reason. Their size, texture, and moisture-holding ability make them easy to inoculate, easy to shake, and dependable for strong mycelium colonization. For growers who prefer a classic grain spawn format, rye jars continue to be a proven option.\u003c\/p\u003e\n\n\u003cp\u003eThese jars are especially useful for growers moving into \u003cstrong\u003ebulk substrate cultivation\u003c\/strong\u003e, \u003cstrong\u003emonotub growing\u003c\/strong\u003e, and \u003cstrong\u003espawn expansion\u003c\/strong\u003e, where clean and vigorous grain spawn can make the rest of the process easier and more consistent.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrom Jar to Bulk Monotub Grow\u003c\/h2\u003e\n\n\u003cp\u003eThe video below shows the process of inoculating a grain jar, allowing it to colonize, breaking it up, and mixing it with substrate for a bulk monotub grow.\u003c\/p\u003e\n\n\u003cdiv style=\"max-width: 760px; margin: 25px auto 10px auto;\" class=\"fade-in-media\"\u003e\n  \u003cdiv style=\"position: relative; overflow: hidden; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n    \u003cdiv style=\"padding: 56.25% 0 0 0; position: relative;\"\u003e\n      \u003ciframe src=\"https:\/\/player.vimeo.com\/video\/1173563699\" title=\"Rye Grain Spawn Jar to Bulk Monotub Grow Video\" style=\"position:absolute; top:0; left:0; width:100%; height:100%;\" frameborder=\"0\" allow=\"autoplay; fullscreen; picture-in-picture\" allowfullscreen\u003e\n      \u003c\/iframe\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePremium Rye Grain Spawn Jars for Mushroom Cultivation\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits 3-Pack Original Rye Grain Spawn Jars\u003c\/strong\u003e gives growers a sterile, ready-to-use rye berry spawn option designed for dependable colonization and easy expansion into bulk substrate. Whether you are inoculating with spores or liquid culture, these jars provide a clean and reliable starting point for mushroom cultivation projects of all sizes.\u003c\/p\u003e\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n      \n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":45978240057493,"sku":"RG32","price":19.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Rye_Jar_32_oz_3pack.jpg?v=1745528521"},{"product_id":"bulk-organic-rye-berries-40-lbs","title":"Bulk Organic Rye Berries","description":"\u003cp\u003e\u003cstrong\u003eBulk Organic Rye Berries for Mushroom Spawn\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eOur \u003cstrong\u003eBulk Organic Rye Berries\u003c\/strong\u003e are one of the most trusted grains used by mushroom cultivators for preparing high-quality \u003cstrong\u003emushroom grain spawn\u003c\/strong\u003e. Clean, consistent, and nutrient-rich, organic rye berries provide an ideal foundation for vigorous mycelium growth and reliable colonization.\u003c\/p\u003e\n\n\u003cp\u003eWidely considered the gold standard grain for spawn production, rye berries offer excellent moisture retention, balanced nutrition, and a grain size that supports fast colonization in both jars and spawn bags.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eBulk Organic Rye Berries (Dry)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAvailable in 40 lb bags or pallet quantities (2,000 lbs)\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-cleaned grain\u003c\/strong\u003e for smooth soaking and sterilization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent moisture retention\u003c\/strong\u003e for healthy mycelium growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIdeal for mushroom grain spawn\u003c\/strong\u003e jars and spawn bags\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCompatible with most gourmet mushroom species\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePallet pricing includes freight\u003c\/strong\u003e to the lower 48 states\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Growers Choose Rye Berries\u003c\/h3\u003e\n\n\u003cp\u003eRye berries remain one of the most widely used grains for producing \u003cstrong\u003emushroom spawn\u003c\/strong\u003e. Their nutrient-rich composition provides carbohydrates, protein, and essential minerals that help support aggressive mycelial growth and strong fruiting potential.\u003c\/p\u003e\n\n\u003cp\u003eThe grain’s excellent moisture retention allows cultivators to properly hydrate and sterilize spawn, creating an ideal environment for colonization and healthy mushroom development.\u003c\/p\u003e\n\n\u003ch3\u003ePerfect for Many Cultivation Methods\u003c\/h3\u003e\n\n\u003cp\u003eOrganic rye berries work well for a variety of mushroom cultivation techniques including:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eGrain spawn jars\u003c\/li\u003e\n\u003cli\u003eMushroom spawn bags\u003c\/li\u003e\n\u003cli\u003eGrain-to-grain transfers\u003c\/li\u003e\n\u003cli\u003eBulk monotub growing\u003c\/li\u003e\n\u003cli\u003eCommercial spawn production\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhether you are a hobby grower preparing small batches or a commercial cultivator producing large volumes of spawn, our \u003cstrong\u003ebulk organic rye berries\u003c\/strong\u003e provide dependable quality and consistent results for mushroom cultivation.\u003c\/p\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"40 Pounds","offer_id":46116312318101,"sku":"RB40","price":44.99,"currency_code":"USD","in_stock":true},{"title":"2000 Pounds","offer_id":46116312350869,"sku":"RB41","price":1845.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Rye_berries_8ceee94e-7a3f-4137-aa9d-270232a9f3aa.jpg?v=1757419458"},{"product_id":"bulk-red-sorghum-milo-grain-40-pounds","title":"Bulk Red Sorghum (Milo) Grain","description":"\u003cp\u003e\u003cstrong\u003eBulk Red Sorghum (Milo) Grain for Mushroom Spawn\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eOur \u003cstrong\u003eBulk Red Sorghum (Milo) Grain\u003c\/strong\u003e is a popular and cost-effective choice for preparing high-quality \u003cstrong\u003emushroom grain spawn\u003c\/strong\u003e. Clean, nutrient-dense, and consistent in size, red milo is widely used by cultivators for its fast colonization and reliable performance in both jars and spawn bags.\u003c\/p\u003e\n\n\u003cp\u003eThe smaller grain size of sorghum creates more inoculation points for mycelium, helping promote faster colonization and vigorous growth during spawn production.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk Red Sorghum (Milo) Grain\u003c\/strong\u003e – Available in 40 lb bags or pallet quantities (2,000 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-Cleaned Grain\u003c\/strong\u003e – Processed to reduce debris and support smooth hydration and sterilization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNutrient-Rich Grain\u003c\/strong\u003e – Naturally high in protein, fiber, and essential nutrients for strong mycelium growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall Grain Size\u003c\/strong\u003e – Provides more inoculation points for faster colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistinct Red Color\u003c\/strong\u003e – Provides contrast for easier observation of mycelium growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSA-Sourced Grain\u003c\/strong\u003e – Sustainably sourced from trusted American farms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePallet Freight Included\u003c\/strong\u003e – Pallet pricing includes shipping to the lower 48 states\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Growers Use Red Milo Grain\u003c\/h3\u003e\n\n\u003cp\u003eRed sorghum offers an ideal balance of affordability, nutrition, and performance for \u003cstrong\u003emushroom spawn preparation\u003c\/strong\u003e. Its compact grain size allows cultivators to create densely packed spawn with many colonization points, helping accelerate the spread of healthy mycelium.\u003c\/p\u003e\n\n\u003cp\u003eThe natural red pigmentation of milo can also make it easier to visually track mycelium growth during colonization in grain spawn jars and bags.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal for Many Cultivation Methods\u003c\/h3\u003e\n\n\u003cp\u003eRed milo grain works well with many mushroom cultivation techniques including:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eGrain spawn jars\u003c\/li\u003e\n\u003cli\u003eMushroom spawn bags\u003c\/li\u003e\n\u003cli\u003eGrain-to-grain transfers\u003c\/li\u003e\n\u003cli\u003eBulk monotub growing\u003c\/li\u003e\n\u003cli\u003eCommercial spawn production\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhether you are preparing small batches or producing spawn at scale, our \u003cstrong\u003ebulk red sorghum grain\u003c\/strong\u003e provides a dependable and economical base for healthy mushroom cultivation.\u003c\/p\u003e","brand":"Myco Labs","offers":[{"title":"40 Pounds","offer_id":46116305535125,"sku":"RR40","price":48.99,"currency_code":"USD","in_stock":false},{"title":"2000 Pount Pallet","offer_id":46116305567893,"sku":"RR41","price":2199.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Red_milo_457d4dd5-1b70-4188-aafe-a73b6c2e6a6d.jpg?v=1757419303"},{"product_id":"bulk-white-millet-grain-40-lbs","title":"Bulk White Millet Grain","description":"\u003cp\u003e\u003cstrong\u003eBulk White Millet Grain by the bag or pallet! \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003eThe ultimate grain choice for serious mushroom growers. Our premium\u003cstrong\u003e white millet grain spawn\u003c\/strong\u003e is triple-cleaned, sustainably grown, and ideal for high-performance spawn production.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e    40 lb bag of dry, dehulled white millet or by the Pallet 2,000 lbs\u003c\/li\u003e\n\u003cli\u003e    Triple-cleaned and low in endospores\u003c\/li\u003e\n\u003cli\u003e    Grown using sustainable, chemical-free practices\u003c\/li\u003e\n\u003cli\u003e    Small grain size = more inoculation points per jar or bag\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhite millet is prized by cultivators for its nutritional density and excellent colonization properties. Its smaller grain size allows for increased inoculation points, resulting in faster and more even mycelial growth across your substrate. With a lower endospore load than other grains, millet helps reduce the risk of contamination—perfect for professional labs and hobby growers alike.\u003c\/p\u003e\n\u003cp\u003eRich in amino acids, protein, and carbohydrates, this millet supports vigorous mycelial development. The grain’s texture provides the ideal mix of moisture and air pockets to help your culture thrive.\u003c\/p\u003e\n\u003cp\u003eWhether you’re prepping spawn bags, jars, or bulk grow setups, our white millet delivers unmatched results in colonization speed, fruiting consistency, and overall yield.\u003c\/p\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"40 Pounds","offer_id":46116293247125,"sku":"WM40","price":47.99,"currency_code":"USD","in_stock":true},{"title":"2000 Pounds (1 Pallet)","offer_id":46116293279893,"sku":"WM41","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/millet_web_final_90d4970f-48a4-492e-8506-72b4a406bcb3.jpg?v=1757419425"},{"product_id":"colonized-grain-spawn-bag-for-commercial-production-3-lbs-choose-your-variety","title":"Colonized Grain Spawn Bag For Commercial Production 3 LBS (Choose Your Variety)","description":"\u003cp\u003eOur 3LB Colonized Grain Spawn, meticulously designed for both professional mushroom growing farms and dedicated mycologists. We understand the critical importance of superior genetics in cultivation, which is why our grain spawn is derived from first-generation genetics of various gourmet mushroom strains, ensuring robust growth and bountiful yields.\u003cbr\u003e\u003cbr\u003eOur commitment to quality is unparalleled. Each 3lb bag of our colonized grain spawn is a testament to our dedication, crafted under the most stringent conditions in our own state-of-the-art facility. This guarantees a product that not only meets but exceeds the expectations of professional cultivators who rely on consistent and reliable service for the smooth operation of their farms.\u003c\/p\u003e\n\u003cp data-rx-type=\"text\" data-rx-first-level=\"true\"\u003ePlease note, we do not provide instructions for making mushroom blocks as each grower's setup and mix preferences vary.\u003c\/p\u003e\n\u003cp data-rx-type=\"text\" data-rx-first-level=\"true\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003ci\u003e\u003cb\u003ePLEASE NOTE!\u003cbr\u003eWe are moving to 5LB Colonized Bags and have limited stock of 3LB remaining. Please see our new 5LB listings \u003ca style=\"color: rgb(255, 42, 0);\" href=\"https:\/\/www.midwestgrowkits.com\/collections\/pre-colonized-grain-spawn-bags?\"\u003ehere\u003c\/a\u003e\u003c\/b\u003e\u003c\/i\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-rx-type=\"text\" data-rx-first-level=\"true\"\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLion's Mane\u003c\/strong\u003e: Celebrated for its cognitive benefits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePink Oyster\u003c\/strong\u003e: Prized for its meaty texture.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBlue Oyster\u003c\/strong\u003e: Distinguished by its unique flavor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eRed Reishi: \u003c\/b\u003eA prized medicinal mushroom\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAntler Reishi:\u003c\/b\u003e A medicinal mushroom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaitake (Hen of the Woods)\u003c\/strong\u003e: Earthy, rich flavor profile.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShiitake\u003c\/strong\u003e: Popular for its unique taste.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePearl White Oyster\u003c\/strong\u003e- Popular Classic Oyster Mushroom\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKing Blue Oyster\u003c\/strong\u003e- Fast, delicious \u0026amp; Top Producing Hybrid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChestnut-\u003c\/strong\u003e Delicious \u0026amp; Nutty Flavor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKing Trumpet Oyster\u003c\/strong\u003e- Large steak like mushrooms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-rx-type=\"text\" data-rx-first-level=\"true\"\u003e \u003c\/p\u003e\n\u003cp data-rx-type=\"text\" data-rx-first-level=\"true\"\u003e \u003c\/p\u003e","brand":"Myco Labs","offers":[{"title":"Lion's Mane","offer_id":46255756476565,"sku":"GS3","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Shiitake","offer_id":46255756509333,"sku":"GS4","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Pearl White Oyster","offer_id":46255756542101,"sku":"GS5","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Golden Yellow Oyster","offer_id":46255756574869,"sku":"GS6","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Red Reishi","offer_id":46255756607637,"sku":"GS7","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Blue Oyster","offer_id":46255756640405,"sku":"GS8","price":20.0,"currency_code":"USD","in_stock":false},{"title":"Pink Oyster","offer_id":46255756673173,"sku":"GS9","price":20.0,"currency_code":"USD","in_stock":false},{"title":"King Blue Oyster","offer_id":46419256049813,"sku":"CGPKB","price":22.0,"currency_code":"USD","in_stock":false},{"title":"Chestnut","offer_id":46419279282325,"sku":null,"price":25.0,"currency_code":"USD","in_stock":false},{"title":"King Trumpet Oyster","offer_id":46497846362261,"sku":null,"price":20.0,"currency_code":"USD","in_stock":false},{"title":"Antler Reishi","offer_id":46521070190741,"sku":null,"price":20.0,"currency_code":"USD","in_stock":true},{"title":"Turkey Tail","offer_id":46521070223509,"sku":null,"price":20.0,"currency_code":"USD","in_stock":false},{"title":"Maitake","offer_id":47434085040277,"sku":null,"price":20.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Lions_Mane_colonized_bag_final.jpg?v=1760441883"},{"product_id":"premium-quick-colonizing-5-grain-jar-32oz-1","title":"Premium Quick-Colonizing 5-grain Jar (32oz)","description":"\u003cstyle\u003e\n@keyframes fadeInSoft {\n  from { opacity: 0; transform: translateY(10px); }\n  to { opacity: 1; transform: translateY(0); }\n}\n.fade-in-media {\n  animation: fadeInSoft 1.2s ease-out forwards;\n  opacity: 0;\n}\n.spec-table,\n.usage-table {\n  width: 100%;\n  border-collapse: collapse;\n  margin: 18px 0 24px 0;\n  font-size: 15px;\n}\n.spec-table th,\n.spec-table td,\n.usage-table th,\n.usage-table td {\n  border: 1px solid #e5e5e5;\n  padding: 10px 12px;\n  text-align: left;\n  vertical-align: top;\n}\n.spec-table th,\n.usage-table th {\n  background: #f7f7f7;\n}\n.info-callout {\n  background: #f8fafc;\n  border: 1px solid #e5e7eb;\n  border-radius: 8px;\n  padding: 16px 18px;\n  margin: 20px 0;\n}\n\u003c\/style\u003e\n\n\u003cp\u003e\u003cstrong\u003ePremium Quick-Colonizing 5-Grain Spawn Jar (32oz Wide Mouth)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSterile Grain Spawn Jar for Fast Colonization, Easy Inoculation \u0026amp; Bulk Growing\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cdiv style=\"text-align: center; margin: 18px 0 28px 0;\" class=\"fade-in-media\"\u003e\n  \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/5grain_jar_timeline_1K_16_9_low.jpg?v=1773499008\" alt=\"5-grain spawn jar colonization timeline showing mushroom grain jar progress from inoculation to full colonization\" style=\"max-width: 100%; height: auto; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eGet faster, more reliable growth with the \u003cstrong\u003eMidwest Grow Kits Premium 5-Grain Spawn Jar\u003c\/strong\u003e. This \u003cstrong\u003e32oz wide mouth sterile grain jar\u003c\/strong\u003e is designed for growers who want easy inoculation, dependable colonization, and strong performance for \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/monotubs-accessories\"\u003emonotubs\u003c\/a\u003e, \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/substrate-bulk-growing\"\u003ebulk substrate\u003c\/a\u003e, and other mushroom cultivation projects.\u003c\/p\u003e\n\n\u003cp\u003eEach jar is filled with a carefully balanced \u003cstrong\u003e5-grain mushroom spawn blend\u003c\/strong\u003e made from rye berries, white milo, red milo, white millet, and red millet. This mix provides a range of grain sizes that creates more inoculation points, helping support rapid mycelium spread and more aggressive colonization compared to single-grain jars or larger bulk containers.\u003c\/p\u003e\n\n\u003cdiv class=\"info-callout\"\u003e\n  \u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eWhy growers like 5-grain jars:\u003c\/strong\u003e Grain spawn jars can be more reliable and faster colonizing for beginners because the smaller grain volume is easy to monitor, easy to shake, and often colonizes quickly with less guesswork.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhy Choose Our 5-Grain Spawn Jar?\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Colonization Potential\u003c\/strong\u003e – Multiple grain sizes create more inoculation points for strong, even growth.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBeginner-Friendly\u003c\/strong\u003e – Grain jars are easy to monitor and often more reliable for first-time growers.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClean \u0026amp; Easy Inoculation\u003c\/strong\u003e – Self-healing injection port makes spore syringe or liquid culture use simple.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Gas Exchange\u003c\/strong\u003e – Each lid includes a 0.22 micron filter disk for healthy airflow.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSterile \u0026amp; Ready to Use\u003c\/strong\u003e – Professionally sterilized and prepared for immediate inoculation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGreat for Bulk Growing\u003c\/strong\u003e – Ideal for mixing with casing mix or bulk substrate in monotubs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eOne (1) 32oz Wide Mouth Glass Spawn Jar\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePremium 5-Grain Blend\u003c\/strong\u003e made with:\n    \u003cul\u003e\n      \u003cli\u003eRye berries\u003c\/li\u003e\n      \u003cli\u003eWhite milo\u003c\/li\u003e\n      \u003cli\u003eRed milo\u003c\/li\u003e\n      \u003cli\u003eWhite millet\u003c\/li\u003e\n      \u003cli\u003eRed millet\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGypsum \u0026amp; Calcium Phosphate\u003c\/strong\u003e for improved grain performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e0.22 Micron Filter Disk\u003c\/strong\u003e for gas exchange\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSelf-Healing Injection Port\u003c\/strong\u003e for clean inoculation\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eSterilized at 15 PSI for 120 Minutes\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable class=\"spec-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eComponent\u003c\/th\u003e\n      \u003cth\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eJar Size\u003c\/td\u003e\n      \u003ctd\u003e32oz Wide Mouth Glass Jar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003ePack Size\u003c\/td\u003e\n      \u003ctd\u003eSingle Jar\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eGrain Blend\u003c\/td\u003e\n      \u003ctd\u003eRye berries, white milo, red milo, white millet, red millet\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eAdditives\u003c\/td\u003e\n      \u003ctd\u003eGypsum and calcium phosphate\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eFilter Type\u003c\/td\u003e\n      \u003ctd\u003e0.22 micron filter disk\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eInjection Port\u003c\/td\u003e\n      \u003ctd\u003eSelf-healing port for spores or liquid culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSterilization\u003c\/td\u003e\n      \u003ctd\u003e15 PSI for 120 minutes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eRecommended Inoculation\u003c\/td\u003e\n      \u003ctd\u003e3–4cc per jar\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRecommended Usage Chart\u003c\/h2\u003e\n\u003cp\u003eUse this quick chart as a general guide when planning your grow.\u003c\/p\u003e\n\u003ctable class=\"usage-table\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eApplication\u003c\/th\u003e\n      \u003cth\u003eRecommended Amount\u003c\/th\u003e\n      \u003cth\u003eNotes\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSpore Syringe per Jar\u003c\/td\u003e\n      \u003ctd\u003e3–4cc\u003c\/td\u003e\n      \u003ctd\u003eInject through the self-healing port for clean inoculation\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eLiquid Culture per Jar\u003c\/td\u003e\n      \u003ctd\u003e5–7cc\u003c\/td\u003e\n      \u003ctd\u003eIdeal for faster colonization when using clean culture\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBulk Substrate Ratio\u003c\/td\u003e\n      \u003ctd\u003e1–2 jars per 5 lbs of casing mix\u003c\/td\u003e\n      \u003ctd\u003eUse based on desired spawn-to-substrate ratio and colonization speed\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eTypical Monotub Use\u003c\/td\u003e\n      \u003ctd\u003e2–3 jars per monotub\u003c\/td\u003e\n      \u003ctd\u003eVaries by tub size and substrate depth\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eBest Use Case\u003c\/td\u003e\n      \u003ctd\u003eMonotubs, trays, bulk grows\u003c\/td\u003e\n      \u003ctd\u003eExcellent for expanding colonized grain into larger fruiting setups\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eDesigned for Faster Colonization\u003c\/h2\u003e\n\u003cp\u003eUnlike single-grain jars, this premium blend combines both larger and smaller grains to help distribute inoculant more effectively and support faster colonization throughout the jar. The result is a vigorous \u003cstrong\u003egrain spawn jar\u003c\/strong\u003e that is easy to shake, easy to expand, and ideal for growers who want dependable performance.\u003c\/p\u003e\n\n\u003cp\u003eThese \u003cstrong\u003emushroom grain jars\u003c\/strong\u003e are especially well-suited for growers moving into \u003cstrong\u003ebulk substrate cultivation\u003c\/strong\u003e and \u003cstrong\u003emonotub growing\u003c\/strong\u003e, where strong grain spawn can make a major difference in colonization speed and overall success. If you prefer larger-scale inoculation, you can also explore our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003espawn bags collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eFrom Jar to Bulk Monotub Grow\u003c\/h2\u003e\n\u003cp\u003eThe video below shows the process of inoculating a grain jar, allowing it to colonize, breaking it up, and mixing it with substrate for a bulk monotub grow.\u003c\/p\u003e\n\n\u003cdiv style=\"max-width: 760px; margin: 25px auto 10px auto;\" class=\"fade-in-media\"\u003e\n  \u003cdiv style=\"position: relative; overflow: hidden; border-radius: 10px; box-shadow: 0 12px 30px rgba(0,0,0,0.12);\"\u003e\n    \u003cdiv style=\"padding: 56.25% 0 0 0; position: relative;\"\u003e\n      \u003ciframe src=\"https:\/\/player.vimeo.com\/video\/1173563699\" title=\"5-Grain Spawn Jar to Bulk Monotub Grow Video\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%;\"\u003e\u003c\/iframe\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003ePremium Grain Spawn Jar for Mushroom Cultivation\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMidwest Grow Kits Premium 5-Grain Spawn Jar\u003c\/strong\u003e gives growers a sterile, ready-to-use grain spawn option built for fast colonization and strong expansion into bulk substrate. Whether you are inoculating with spores or liquid culture, this jar is designed to simplify the process and improve consistency from start to finish.\u003c\/p\u003e\n\n\u003cdiv style=\"margin: 30px 0; padding: 22px; border-radius: 14px; background: linear-gradient(135deg, #f8fbff, #eef6ff); border: 1px solid #dbeafe;\"\u003e\n  \u003cdiv style=\"display: flex; flex-wrap: wrap; align-items: center; gap: 20px;\"\u003e\n    \u003cdiv style=\"flex: 1 1 260px;\"\u003e\n      \u003ch3 style=\"margin: 0 0 8px; font-size: 22px;\"\u003e\n        New to Grain Spawn?\n      \u003c\/h3\u003e\n\n      \u003cp style=\"margin: 0 0 14px; font-size: 15px; color: #374151;\"\u003e\n        Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.\n      \u003c\/p\u003e\n\n      \u003ca href=\"https:\/\/www.midwestgrowkits.com\/pages\/spawn-bag-grain-jar-guide-how-to-inoculate-incubate-colonize\" style=\"display: inline-block; padding: 12px 18px; background: #1e90ff; color: white; border-radius: 8px; font-weight: 600; text-decoration: none;\"\u003e\n        Read the Full Guide →\n      \u003c\/a\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv style=\"flex: 1 1 180px;\"\u003e\n      \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Spawn_bag_guide_hero_1.png?v=1776512883\" alt=\"Spawn Bag and Grain Jar Guide for 5-grain spawn jars\" style=\"width: 100%; border-radius: 10px;\"\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kit's","offers":[{"title":"Default Title","offer_id":46036883177621,"sku":"PQC2","price":8.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/5grain_jar_single_30oz_5469dcc7-5898-48db-b0a6-ca4055b0e45a.jpg?v=1747762972"},{"product_id":"bulk-white-sorghum-milo-grain","title":"Bulk White Sorghum (Milo) Grain","description":"\u003cp\u003e\u003cstrong\u003eBulk White Sorghum (Milo) Grain for Mushroom Cultivation\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eUpgrade your mushroom cultivation with our premium \u003cstrong\u003eBulk White Sorghum (Milo) Grain\u003c\/strong\u003e—a reliable and cost-effective choice for preparing nutrient-rich \u003cstrong\u003emushroom grain spawn\u003c\/strong\u003e. White milo is widely used by growers for its smaller grain size, rapid colonization, and clean appearance, making it one of the best grains for mushroom growing and spawn production.\u003c\/p\u003e\n\n\u003ch3\u003eProduct Features\u003c\/h3\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailable in Bulk\u003c\/strong\u003e – Choose from 40 lb bags or full pallet quantities (2,000 lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium White Sorghum Grain\u003c\/strong\u003e – Ideal for preparing mushroom grain spawn bags and jars\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTriple-Cleaned Grain\u003c\/strong\u003e – Carefully processed for smooth hydration, sterilization, and reduced debris\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcellent Nutrient Profile\u003c\/strong\u003e – Naturally rich in protein and carbohydrates to support strong mycelium growth\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmall Grain Size\u003c\/strong\u003e – Provides more inoculation points for faster colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLight Grain Color\u003c\/strong\u003e – Makes it easier to monitor colonization and identify contamination\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUSA-Sourced Grain\u003c\/strong\u003e – Consistently sourced from trusted American farms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePallet Shipping Available\u003c\/strong\u003e – Pallet pricing includes free shipping within the lower 48 states\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Growers Use White Sorghum (Milo)\u003c\/h3\u003e\n\n\u003cp\u003eWhite milo provides an excellent balance of performance and affordability for preparing \u003cstrong\u003emushroom spawn\u003c\/strong\u003e. Its smaller kernels increase the number of inoculation points in each jar or spawn bag, which can help accelerate colonization and produce more vigorous mycelium growth.\u003c\/p\u003e\n\n\u003cp\u003eThe lighter color of white sorghum also makes it easier for cultivators to visually inspect their grain spawn and quickly identify healthy mycelium or potential contamination.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal for Many Cultivation Methods\u003c\/h3\u003e\n\n\u003cp\u003eThis grain works well for a wide range of mushroom cultivation techniques including:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eGrain spawn jars\u003c\/li\u003e\n\u003cli\u003eMushroom spawn bags\u003c\/li\u003e\n\u003cli\u003eGrain-to-grain transfers\u003c\/li\u003e\n\u003cli\u003eBulk monotub growing\u003c\/li\u003e\n\u003cli\u003eCommercial spawn production\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWhether you're a hobby grower preparing small batches or a commercial cultivator scaling production, our \u003cstrong\u003ebulk white sorghum grain\u003c\/strong\u003e provides a dependable foundation for healthy mushroom spawn and consistent growing results.\u003c\/p\u003e","brand":"Myco Labs","offers":[{"title":"40 Pounds","offer_id":46385423843477,"sku":"WS40","price":48.99,"currency_code":"USD","in_stock":true},{"title":"2000 Pound Pallet","offer_id":46385423876245,"sku":"PWM2","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/White_milo.jpg?v=1757419404"},{"product_id":"lions-mane-colonized-grain-spawn-bag-5-lb","title":"Lion's Mane Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Lion's Mane (\u003cem\u003eHericium erinaceus\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Lion's Mane is one of the most sought-after gourmet and functional varieties, prized for its delicate seafood-like flavor and its reputation for supporting cognitive health.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Lion's Mane spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Lion's Mane (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3T Spawn bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eLion's Mane Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003eHericium erinaceus\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, cottony, coral-like rhizomorphic growth. Ships bright white, usually arrives with white specs on grain. \u003cstrong\u003eBreaks up easily in transit but can be used immediately. Normal for Lion's Mane.\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, hardwood sawdust + bran, supplemented hardwood pellets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e60–70°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet + functional (nootropic compounds)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\/products\/lions-mane-liquid-culture-syringe-10cc\"\u003eLion's Mane Liquid Culture Syringe\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47405735674005,"sku":"LMGS","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Grain_spawn_lion_2.jpg?v=1780511645"},{"product_id":"blue-oyster-colonized-grain-spawn-bag-5-lb","title":"Blue Oyster Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Blue Oyster (\u003cem\u003ePleurotus ostreatus\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Blue Oyster is one of the fastest, most aggressive colonizers you can grow, with striking blue-grey caps that lighten to silvery tan as they fruit — forgiving, high-yielding, and a favorite of commercial growers and first-timers alike.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Blue Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Blue Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3T Spawn bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eBlue Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePleurotus ostreatus\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, fast, aggressive rhizomorphic growth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, hardwood sawdust + bran, straw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e55–65°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47406212579477,"sku":"BOGS","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Blue_oyster_grain_spawn.jpg?v=1780513419"},{"product_id":"golden-oyster-colonized-grain-spawn-bag-5-lb","title":"Golden Oyster Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Golden Oyster (\u003cem\u003ePleurotus citrinopileatus\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Golden Oyster fruits in vivid sunshine-yellow clusters with a delicate, nutty cashew aroma, and colonizes fast and prolifically. Its color makes it a standout at farmers markets and on restaurant plates alike.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh.\u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Golden Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Golden Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 3T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eGolden Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePleurotus citrinopileatus\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, fast, fluffy growth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, hardwood sawdust + bran, straw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e65–80°F (warm-loving)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47406239580309,"sku":"GOGS","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Golden_oyster_grain_spawn.jpg?v=1780515252"},{"product_id":"king-oyster-colonized-grain-spawn-bag-5-lb","title":"King Oyster Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized King Oyster (\u003cem\u003ePleurotus eryngii\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. King Oyster is prized for its thick, meaty stems and mild umami flavor, with a firm scallop-like texture that holds up beautifully to searing, roasting, and grilling. It colonizes a touch slower than other oysters but rewards the wait with substantial, restaurant-grade fruits.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our King Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen King Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 3T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eKing Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePleurotus eryngii\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, dense growth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, supplemented hardwood sawdust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e60–70°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eIntermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47406381105301,"sku":"KOGS","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/King_oyster_colonized_grain.jpg?v=1780521534"},{"product_id":"black-pearl-king-oyster-grain-spawn-5-lb","title":"Black Pearl King Oyster Grain Spawn 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Black Pearl King Oyster (\u003cem\u003ePleurotus ostreatus × eryngii\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. A prized cross of Oyster and King Oyster, Black Pearl produces dramatic dark grey-black caps over thick, meaty stems — pairing oyster vigor and speed with king-oyster substance and flavor. It's robust, forgiving, and one of the most striking mushrooms you can bring to market.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh.\u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Black Pearl King Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Black Pearl King Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3T Spawn bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eBlack Pearl King Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cem\u003ePleurotus ostreatus × eryngii\u003c\/em\u003e (hybrid)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, vigorous growth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, supplemented hardwood sawdust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e60–70°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-to-intermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47412368572565,"sku":"BPKGS","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/BPK_colonized_grain.jpg?v=1780658682"},{"product_id":"pearl-white-oyster-grain-spawn-bag-5-lb","title":"Pearl White Oyster Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Pearl White Oyster (\u003cem\u003ePleurotus ostreatus\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Pearl White is the classic gourmet oyster: fast, forgiving, high-yielding, and tolerant of a wide temperature range. Its mild, versatile flavor and dependable performance make it a year-round staple for growers at any scale.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Pearl White Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Pearl White Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 3T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003ePearl White Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePleurotus ostreatus\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, fast, rhizomorphic growth\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, hardwood sawdust + bran, straw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e55–75°F (wide range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003en\/a\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47412422475925,"sku":"PWGS","price":24.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Pearl_oyster_grain_spawn.jpg?v=1780659463"},{"product_id":"maitake-colonized-grain-spawn-bag-5-lb","title":"Maitake Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Maitake (\u003cem\u003eGrifola frondosa\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Maitake, known as Hen of the Woods, fruits in large feathered rosettes with a rich, earthy flavor and a celebrated functional reputation. It's a slower, more advanced variety that demands the right conditions — but few mushrooms are as prized on the plate or in the market.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh.\u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Maitake spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Maitake (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 10T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eMaitake Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003eGrifola frondosa\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, slow-growing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eHardwood sawdust + bran, Master's Mix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e55–65°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eAdvanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet + functional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eUnicorn 10T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47412447084693,"sku":"MTGS","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Maitake_grain_spawn.jpg?v=1780660010"},{"product_id":"pink-oyster-colonized-grain-spawn-bag-5-lb","title":"Pink Oyster Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Pink Oyster (\u003cem\u003ePleurotus djamor\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Pink Oyster is the fastest colonizer of all the oysters, fruiting in brilliant ruffled pink clusters that turn heads at any market. It loves warm weather, yields heavily, and develops a savory, almost bacon-like flavor when cooked crisp.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh.\u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Pink Oyster spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Pink Oyster (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 10T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003ePink Oyster Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePleurotus djamor\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite to pale pink, very fast and aggressive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, hardwood sawdust + bran, straw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e65–85°F (warm\/tropical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eBeginner-friendly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eUnicorn 10T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47412454064277,"sku":"POCG","price":24.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Pink_oyster_grain_spawn.jpg?v=1780660258"},{"product_id":"shiitake-colonized-grain-spawn-bag-5-lb","title":"Shiitake Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Shiitake (\u003cem\u003eLentinula edodes\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Shiitake delivers deep, savory umami and a meaty texture that's made it a kitchen staple worldwide. It takes patience — a longer colonization and a browning phase before fruiting — but the rich, restaurant-grade harvest is well worth the wait.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Shiitake spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Shiitake (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 10T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eShiitake Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003eLentinula edodes\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite; forms a brown mycelial skin before fruiting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSupplemented hardwood sawdust, Master's Mix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e55–70°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eIntermediate (longer colonization + browning phase)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eUnicorn 10T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47419002519701,"sku":"SHCG","price":26.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Shiitake_mushroom_colonized_grain.jpg?v=1780941343"},{"product_id":"chestnut-colonized-grain-spawn-bag-5-lb","title":"Chestnut Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Chestnut (\u003cem\u003ePholiota adiposa\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Chestnut fruits in handsome clusters of golden-brown caps with a crunchy texture and a sweet, nutty flavor. Unlike the delicate oysters, it stores well after harvest — a real advantage for market growers and restaurant accounts.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Chestnut spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Chestnut (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 10T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003eChestnut Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cem\u003ePholiota adiposa\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite to pale tan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSupplemented hardwood sawdust, Master's Mix\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e50–65°F (cooler-loving)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eIntermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eUnicorn 10T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47419032567957,"sku":"CMGS","price":28.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Chestnut_grain_sapwn.jpg?v=1780941938"},{"product_id":"pioppino-colonized-grain-spawn-bag-5-lb","title":"Pioppino Colonized Grain Spawn Bag 5 LB","description":"\u003cstyle\u003e.mgk-product-content .b { font-weight:600 !important; }\u003c\/style\u003e\n\u003cdiv class=\"mgk-product-content\"\u003e\n\u003cp\u003e\u003cspan class=\"b\"\u003eFully colonized Pioppino (\u003cem\u003eAgrocybe aegerita\u003c\/em\u003e) grain spawn, 5 LB\u003c\/span\u003e, grown on our millet-based grain blend in a filtered Unicorn 3T bag. Built on premium first-generation genetics and produced fresh at our Illinois lab — fully colonized before it ships and ready to break up and inoculate the moment it arrives. Pioppino fruits in elegant clusters of bronze-brown caps on crisp white stems, with a rich, nutty, peppery flavor and a firm texture that holds up beautifully in the pan. A long-time favorite of chefs, it also stores better than most gourmet varieties.\u003c\/p\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\n\u003cspan class=\"b\"\u003e✓ Made Fresh — Ships Same or Next Business Day\u003c\/span\u003e\u003cbr\u003eWe don't stockpile spawn on a shelf for months. Bags are produced on a rolling schedule and held fully colonized, then shipped fresh. \u003c\/div\u003e\n\u003cdiv class=\"mgk-callout mgk-callout-ships\"\u003e\u003c\/div\u003e\n\u003ch3\u003ePremium Genetics, Sourced Worldwide\u003c\/h3\u003e\n\u003cp\u003eStrong genetics are the difference between a reliable commercial run and a disappointing one — so we built our library from the best sources we could find. Our Pioppino spawn starts with our own in-house master culture collection at Myco Labs, refined over years of isolation work, and is expanded through a partnership with \u003cspan class=\"b\"\u003eone of the largest commercial culture suppliers in Canada\u003c\/span\u003e, along with select strains sourced from the \u003cspan class=\"b\"\u003eUK and Asia\u003c\/span\u003e. Every culture is held as first-generation commercial genetics and selected for vigorous, clean colonization and true-to-type fruiting. This is the genetic foundation serious cultivators build a farm on.\u003c\/p\u003e\n\u003ch3\u003eWhat You'll Receive\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e5 LB of fully colonized grain spawn\u003c\/span\u003e — premium first-gen Pioppino (bags are filled generously and typically weigh in above 5 LB)\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMillet-based grain blend\u003c\/span\u003e — primarily white and red millet with a small amount of milo; the fine grain gives plenty of inoculation points for fast, even colonization\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eUnicorn 10T bag\u003c\/span\u003e with a 0.22-micron filter patch and self-healing injection port\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003e3-mil construction\u003c\/span\u003e, sterilized in a 3-hour autoclave cycle\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eLab-inspected\u003c\/span\u003e for contamination and produced fresh at Myco Labs (Illinois, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow to Use Your Grain Spawn\u003c\/h3\u003e\n\u003cp\u003eThese bags are made to be broken up and mixed directly into sterilized bulk substrate. The most popular method is Master's Mix block production:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eMix into Master's Mix\u003c\/span\u003e — break up the colonized grain and combine it with our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003e5 LB Sterilized Master's Mix\u003c\/a\u003e. One 5 LB bag inoculates 12–13 Master's Mix bags. Step-by-step walkthrough here: \u003ca href=\"https:\/\/www.midwestgrowkits.com\/blogs\/blog-1-growing-101-more\/how-to-use-grain-spawn-with-master-s-mix-substrate\"\u003eHow to Use Grain Spawn with Master's Mix Substrate\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eExpand to more grain\u003c\/span\u003e — use a portion to inoculate additional sterilized grain (a grain-to-grain transfer) and multiply your spawn before spawning to bulk\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan class=\"b\"\u003eSpawn a monotub or bulk bed\u003c\/span\u003e — mix into any properly prepared pasteurized or sterilized bulk substrate\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eFor grain-to-grain transfers or any open work, do it in front of a \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003elaminar flow hood or clean-room setup\u003c\/a\u003e. A few minutes under HEPA-filtered air keeps contamination out and dramatically improves your success rate — especially when you're expanding spawn rather than going straight to a sealed Master's Mix bag.\u003c\/p\u003e\n\u003ch3\u003ePioppino Growing Characteristics\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eLatin name\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cem\u003eAgrocybe aegerita\u003c\/em\u003e (syn. \u003cem\u003eCyclocybe aegerita\u003c\/em\u003e)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eMycelium appearance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite, cottony, becoming slightly tomentose\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSpawn-to-substrate ratio\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e~1 part spawn to 3 parts substrate (one 5 LB bag → 12–13 Master's Mix bags)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003ePreferred substrate\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMaster's Mix, supplemented hardwood sawdust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eFruiting temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e55–65°F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eDifficulty\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eIntermediate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eUse category\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eGourmet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eGrain Spawn Specifications\u003c\/h3\u003e\n\u003ctable class=\"mgk-spec-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eNet weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e5 LB advertised (typically fills to ~5.5 LB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eGrain\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003ePrimarily white and red millet with a small amount of milo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eBag\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eUnicorn 10T, 3-mil, 0.22-micron filter patch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eInjection port\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eSelf-healing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterilization\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e3-hour autoclave cycle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eSterility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eProduced under HEPA-filtered laminar flow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"b\"\u003eShelf life\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e90 days best \/ 120 days refrigerated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eSterility \u0026amp; Quality Standards\u003c\/h3\u003e\n\u003cp\u003eEvery bag is produced and inspected at Myco Labs under HEPA-filtered laminar flow, then incubated in a dedicated clean room until fully colonized. Each bag is visually inspected for contamination before it's approved for shipment. If it doesn't look right, it doesn't ship.\u003c\/p\u003e\n\u003ch3\u003eShipping \u0026amp; Handling\u003c\/h3\u003e\n\u003cp\u003eSpawn ships in padded packaging. In summer months (May–September) or to hot-climate destinations, we include a cold pack at no additional cost. Use your spawn promptly for best results; an unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated at 35–40°F. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003ch3\u003eRecommended Companion Products\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/products\/sterilized-masters-mix-bag-5-lbs\"\u003eSterilized Master's Mix (5 LB)\u003c\/a\u003e — the intended pairing; one spawn bag inoculates 12–13\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eLaminar Flow Hoods \u0026amp; Clean Room Equipment\u003c\/a\u003e — for contamination-free grain transfers\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/liquid-culture-syringes\"\u003eLiquid Culture Syringes\u003c\/a\u003e — same genetics, ready-to-inject format\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/spawn-bags\"\u003eUninoculated Spawn Bags\u003c\/a\u003e — to colonize your own grain from culture\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eIs this ready to use, or do I need to colonize it?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eIt's fully colonized and ready to go. Break it up and mix it directly into sterilized Master's Mix or your bulk substrate of choice — no inoculation, sterilization, or colonization wait on your end.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow many Master's Mix blocks will one 5 LB bag inoculate?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOne 5 LB bag inoculates 12–13 of our 5 LB Sterilized Master's Mix bags at our recommended ratio, turning a single spawn bag into a full block run.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eDo I need a flow hood to use this?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eNot for the simplest workflow — breaking the spawn into a freshly opened Master's Mix bag in a clean, still space works for many growers. But for grain-to-grain transfers or any extended open work, a laminar flow hood or clean-room setup with HEPA-filtered air significantly lowers contamination risk. We carry both in our \u003ca href=\"https:\/\/www.midwestgrowkits.com\/collections\/flow-hoods-clean-room\"\u003eflow hood and clean room collection\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhere do your genetics come from?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eOur cultures come from our own in-house master collection at Myco Labs, plus a partnership with one of the largest commercial culture suppliers in Canada and select strains sourced from the UK and Asia. Everything is maintained as first-generation commercial genetics and selected for vigor and true-to-type fruiting.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eHow fresh is it, and how long will it stay viable?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eEvery bag is made fresh at our Illinois lab — never stockpiled for months. An unopened bag stays at peak viability for about 90 days at room temperature, or up to 120 days refrigerated. Refrigerate if you're not using it right away.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eCan I use this in a monotub instead of Master's Mix blocks?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eYes. While these are built for breaking up into sterilized Master's Mix, the colonized grain can be mixed into any properly prepared bulk substrate, including a monotub.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"mgk-faq\"\u003e\n\u003csummary\u003e\u003cspan class=\"b\"\u003eWhat if my bag arrives contaminated or damaged?\u003c\/span\u003e\u003c\/summary\u003e\n\u003cp\u003eWe guarantee every bag ships fully colonized and contamination-free. If you receive a contaminated or damaged bag, contact us within 5 days of delivery with a photo and we'll replace it free of charge.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"Midwest Grow Kits","offers":[{"title":"Default Title","offer_id":47429845549205,"sku":"PPCG","price":24.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/files\/Change_the_label_so_it_says_Pi_Nano_Banana_2_43989.png?v=1781113903"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/0679\/7461\/collections\/Grain_spawn_750_x_225.jpg?v=1779188785","url":"https:\/\/www.midwestgrowkits.com\/collections\/grain-spawn.oembed?page=2","provider":"Midwest Grow Kits","version":"1.0","type":"link"}