Premium Quick-Colonizing 5-grain Jar (32oz)
Premium Quick-Colonizing 5-grain Jar (32oz) is backordered and will ship as soon as it is back in stock.
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Premium Quick-Colonizing 5-grain Jar (32oz)
Description
Description
Premium Quick-Colonizing 5-Grain Spawn Jar (32oz Wide Mouth)
Sterile Grain Spawn Jar for Fast Colonization, Easy Inoculation & Bulk Growing
Get faster, more reliable growth with the Midwest Grow Kits Premium 5-Grain Spawn Jar. This 32oz wide mouth sterile grain jar is designed for growers who want easy inoculation, dependable colonization, and strong performance for monotubs, bulk substrate, and other mushroom cultivation projects.
Each jar is filled with a carefully balanced 5-grain mushroom spawn blend 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.
Why growers like 5-grain jars: 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.
Why Choose Our 5-Grain Spawn Jar?
- Fast Colonization Potential – Multiple grain sizes create more inoculation points for strong, even growth.
- Beginner-Friendly – Grain jars are easy to monitor and often more reliable for first-time growers.
- Clean & Easy Inoculation – Self-healing injection port makes spore syringe or liquid culture use simple.
- Reliable Gas Exchange – Each lid includes a 0.22 micron filter disk for healthy airflow.
- Sterile & Ready to Use – Professionally sterilized and prepared for immediate inoculation.
- Great for Bulk Growing – Ideal for mixing with casing mix or bulk substrate in monotubs.
What’s Included
- One (1) 32oz Wide Mouth Glass Spawn Jar
-
Premium 5-Grain Blend made with:
- Rye berries
- White milo
- Red milo
- White millet
- Red millet
- Gypsum & Calcium Phosphate for improved grain performance
- 0.22 Micron Filter Disk for gas exchange
- Self-Healing Injection Port for clean inoculation
- Sterilized at 15 PSI for 120 Minutes
Product Specifications
| Component | Details |
|---|---|
| Jar Size | 32oz Wide Mouth Glass Jar |
| Pack Size | Single Jar |
| Grain Blend | Rye berries, white milo, red milo, white millet, red millet |
| Additives | Gypsum and calcium phosphate |
| Filter Type | 0.22 micron filter disk |
| Injection Port | Self-healing port for spores or liquid culture |
| Sterilization | 15 PSI for 120 minutes |
| Recommended Inoculation | 3–4cc per jar |
Recommended Usage Chart
Use this quick chart as a general guide when planning your grow.
| Application | Recommended Amount | Notes |
|---|---|---|
| Spore Syringe per Jar | 3–4cc | Inject through the self-healing port for clean inoculation |
| Liquid Culture per Jar | 5–7cc | Ideal for faster colonization when using clean culture |
| Bulk Substrate Ratio | 1–2 jars per 5 lbs of casing mix | Use based on desired spawn-to-substrate ratio and colonization speed |
| Typical Monotub Use | 2–3 jars per monotub | Varies by tub size and substrate depth |
| Best Use Case | Monotubs, trays, bulk grows | Excellent for expanding colonized grain into larger fruiting setups |
Designed for Faster Colonization
Unlike 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 grain spawn jar that is easy to shake, easy to expand, and ideal for growers who want dependable performance.
These mushroom grain jars are especially well-suited for growers moving into bulk substrate cultivation and monotub growing, 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 spawn bags collection.
From Jar to Bulk Monotub Grow
The 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.
Premium Grain Spawn Jar for Mushroom Cultivation
The Midwest Grow Kits Premium 5-Grain Spawn Jar 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.
New to Grain Spawn?
Learn exactly how to inoculate, incubate, and fully colonize your spawn bags or grain jars with our step-by-step guide.
Read the Full Guide →
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Let customers speak for us
Fast and easy colonization! These grain jars showed growth after just 10 days. My previous efforts with the all-in-one bags are taking MUCH longer but also working. Thank you Midwest Grow Kits 🙏
I love the people and the products. The people at MWGK clearly care about the integrity of the community they serve.
The monotub works amazing only had it a couple of weeks and about to have second harvest I used AIO grow bag for first flush and move to tub for second and its great not having to watch 24/7. Thanks Midwest
Four days after mixing grain, Select substrate, and the Midwest horse manure booster - the results speak for themselves.
It has everything you need for a fast, large flush success with fewer moving parts than a standard monotub. It is a surprisingly versatile option for more advanced students. Pic is 5 grain jar at 8 days. GT LM This is where I shop, now.
Rich, perfectly field-wet, sterile and it is perfect for those many varieties that won’t thrive quite as well in Bulk Substrate and Casing Mix, which I’ve seen as best for psilocybes/cyanescens. I’m using it for the first time with Lions Mane and King Trumpets. So far so good, 7 days and primordial and pins are starting to flourish. It drains better and is lighter than MGK’s Bulk Casing and Substrate. Great product.
Love the heater and how even and exact it heats. I set mine to 76 degrees and my room fluctuates from 64-75 and it holds solid at 75 degrees. I used a probe thermometer to double check the substrate level temp and its exactly 1 degree less than the heater setting. Another tip, I only needed to use the round monotub thermometer to check my humidity levels every so often. I would leave a filter disk on that hole instead of the thermometer. The only time it came in handy was after my first flush when humidity started to drop. I was able to use that gauge and check whether I needed to mist. Overall great kit and worth the money!
Ive bought mutiple jars before i came up with my own recipe, every jar produced healthy cultures, even if ones damaged in shipping they replace immediately, highly recommend
Very small chance that you get a contaminate you already had it and you’re either culture spores etc. their stuff is 100% sterile every time 100% of the time everything is viable never had a problem been shopping with them for sometime
It’s very good product and I highly recommend it to everyone.👏👏👏
I love my magnetic stir plate it works great for Liquid culture jars.
My bag had a slow start, but excellent finish. Oak Ridge.
Great product for my cannabis best deal around arrived fast thank you Midwest grow kits definitely will be purchasing again
So far it seems very sturdy and I will give another review after I fill her up. Im just getting started with this life changing hobby and this will hold up strong
It was a price commitment, however it equated to less than I would spend on most any DIY project. I decided to purchase it and have since done spore work, agar transfers to agar and grain, culture to spawn bag inoculations, cloming and prints all with a 0% contamination rate. I practice about as good a sterile technique as I can mustard, considering I perform all my work on my kitchen table. Im consistently amazed by how flawless everything has turned out since adding this to my operations. I consider it indispensable. Instead of the double sided tape provided, i purchased some plastic velcro tape from the Gnome Depot and use it to affix the pvc guards to the sides. When i am done, i have also made it so i can sandwich them together and store them one the front to protect that precious filter when not in use. If you can swing it, buy it. Takes the risk out of procedure. Im bummed i cheaped out on the stainless riser offered at a discount with purchase of the LFH. That would have been exceedingly useful, but I have since utilized a baking drying rack to much success. Now go forth and frolic in the dung!
