The Original Rye Spawn Bags
The Original Rye Spawn Bags is backordered and will ship as soon as it is back in stock.
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The Original Rye Spawn Bags
Description
Description
The Original Rye Grain Spawn Bags (2-Pack)
Classic Performance. Superior Nutrition.
Trusted since the 1970s, our Original Rye Grain Spawn Bags are the gold standard for serious mushroom cultivators. Each bag is loaded with over 2 quarts of nutrient-enhanced organic rye berries—hydrated to perfection, pH-balanced, and fortified with essential minerals for aggressive mycelium growth and long-term fruiting performance.
Rye grain’s naturally high nitrogen content consistently outperforms millet-based alternatives, supporting faster colonization and stronger second and third flushes when used for bulk substrate production.
How to Inoculate & Colonize Rye Grain Spawn Bags
These rye grain spawn 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.
After inoculation, incubate the bags in a clean, warm environment and allow the mycelium to fully colonize the rye grain. Once solid white growth is achieved, the spawn is ready for bulk substrate or monotub use.
Breaking Up Rye Spawn for Bulk Mushroom Grows
When fully colonized, rye grain spawn can be easily broken up and mixed into bulk substrate such as coco coir, manure-based blends, or Master’s Mix Bags. This makes rye spawn ideal for monotubs, grow bins, and high-yield bulk cultivation methods.
Rye kernels separate cleanly and distribute evenly throughout the substrate, helping create multiple strong inoculation points for faster colonization and more uniform pin sets.
What’s Included
- 2 Original Rye Grain Spawn Bags (2.25–2.5 lbs each)
- Cereal-grade organic rye berries, mineral water, gypsum, and nutrient-enhancing herbs
- Self-healing high-temperature injection ports for sterile inoculation
- 3mm polypropylene bags with 0.22-micron filter patches for optimal gas exchange
- Step-by-step photo guide + instructional videos
Why Choose Our Rye Grain Spawn Bags?
-
High-Nitrogen Grain for Long-Term Yields
Rye supports stronger colonization and extended fruiting cycles compared to millet or milo. -
Precision Hydrated & Professionally Sterilized
Custom hydration and air-drying followed by industrial autoclave sterilization at 20–22 PSI for 180 minutes ensures ultra-clean spawn. -
Ideal for Bulk & Monotub Growing
Large grain size and nutrient density make these bags perfect for high-yield bulk substrate production. -
Contamination-Resistant Design
Filter patch placement and high-mounted injection ports reduce handling errors and improve success rates.
Pro Tips for Best Results
Using a sterile technique, inject 5-7 cc of your favorite liquid culture or grain-loving spores directly into the injection port. Gently shake after initial colonization to speed up grain-to-grain spread. Once fully colonized, break up and transfer to bulk substrate for maximum yields.
These rye spawn bags pair perfectly with monotubs, bulk substrate blocks, and high-humidity fruiting environments.
Let customers speak for us
I have always had a great experience with Midwest products. There delivery time is fast and exactly what I ordered. Not once has my substrate been to dry or have I had any contamination. I only have two tubs going right now but definitely will be expanding soon. Thank you for great products at affordable prices.
...and that is viable liquid culture mushroom spores, enough for lots of microscope work, let me tell you.
I pre-stired the jar to show the floating mycellium after nine days. I've been real conservative on the temperature, not letting it get too high, but still I've got great growth.
Once I saw the successful first attempt, I ordered another 10 ounce kit to arrive shortly.
Hey Midwest, thanks for offering the two sizes of the LC kit. I can feel big time, while using the small kit.
Wish you had stickers so I could rep you.
Been doing some agar-related experiments in this guy along with spawn bag inouculation (which I'm not sure is necessary because I've never had a contamination from a Midwest Grow Kits spawn bag - the 5-grain ones are top doggity!)
Just what I needed. I really like the scale and the folding cover.
I’ve been using them for a couple of years and they have always given me great products and customer service is where they really shine though so if you are just starting out or like me an old hand at mushroom cultivation this is the place you need to be pictured is just one of the sizes and the picture is from a second flush also🤪
This worked perfectly as described. Easy to use and the yields were amazing. I make my own now but still get lazy sometimes and order this.
Enjoy
This thing was beautiful to grow. Exactly as described.
Couldn’t be easier or more awesome of an experience. Highly recommend due to its ease and overall experience. Not to mention the benefits from the fruits. I add dehydrated/ground fruits to my morning coffee for immune boost, anti inflammatory and energy boosting properties. You will be glad you got this one. The price is so cheap and the experience is so worth it. Enjoy
I placed my very first grow in a minitub into the automated ecosphere. It kept humidity and light schedule perfect with FAE on a timer 60 seconds on 3x a day. Fruits were huge and plentiful! Im going to fruit my BRF cakes in there next. Midwest is my main supplier of kits and materials. I have the Ultimate Kit with incubator also. Set it up per instructions and it'll serve you well for a long time!
This my second time ordering and both times have been great! No contamination and a fantastic final product. I will definitely order again.
Your products have been consistent and i get the best results with it..
Thank you for this service..
Came in 4 days
Colonized in 14 days now in fruiting chamber .
Looking forward for fresh turkey tail mushrooms.
I recently bought the Midwest Growers small mushroom monotub 2-pack (amazing price for two). They are perfect size for a colonized block! I am currently growing two shiitake blocks and one king trumpet mushroom block and the tubs make it very easy.
My second time growing. First time I bought two different brands of all in one bags from Amazon. Did not work, they both stalled and never fruited. This little kit was my last ditch effort and I’m sitting here less than 8 weeks after ordering and amazing results
I ordered 2 - 10lb blocks and was a little worried that they were plainly wrapped and different sizes. I weighed them and 1 was 8lbs the other 12lbs so the total was correct. Expanded to the expected volume (picture included of smaller block)
These are the best Monotubs on the market for the price they are built well and I wish I had 4 more lol
https://youtube.com/shorts/6uqucyx0RJk?feature=share
