3-Pack Premium Quick-Colonizing 5-grain Jar (32oz)
3-Pack Premium Quick-Colonizing 5-grain Jar (32oz) is backordered and will ship as soon as it is back in stock.
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3-Pack Premium Quick-Colonizing 5-grain Jar (32oz)
Description
Description
3-Pack Premium Quick-Colonizing 5-Grain Spawn Jars (32oz Wide Mouth)
Sterile Mushroom Grain Spawn Jars for Fast Colonization, Easy Inoculation & Bulk Growing
Get faster, more even growth with Midwest Grow Kits Premium 5-Grain Spawn Jars. This 3-pack of 32oz wide mouth sterile grain jars is designed for growers who want reliable colonization, clean inoculation, and strong performance for monotubs, bulk substrates, 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 wide range of grain sizes to create more inoculation points, helping support rapid mycelium spread and more aggressive colonization compared to single-grain jars.
Why growers like 5-grain jars: The blend of large and small grains helps create more surface area for colonization, cleaner grain distribution after shaking, and excellent expansion into bulk substrate for monotub grows.
Why Choose Our 5-Grain Spawn Jars?
- Fast Colonization Potential – Multiple grain sizes create more inoculation points for strong, even growth.
- 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.
- Trusted by Growers – A dependable option for beginners and experienced growers alike.
What’s Included
- Three (3) 32oz Wide Mouth Glass Spawn Jars
-
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 Jars |
| Pack Size | 3 Jars Per Pack |
| 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 bulk 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 | Recommended for monotub and bulk substrate grows |
| 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 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.
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 Jars for Mushroom Cultivation
The Midwest Grow Kits 3-Pack Premium 5-Grain Spawn Jars 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 help simplify the process and improve consistency from start to finish.
Our Growing Experts Recommend
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Let customers speak for us
I have been using this coir for over a year. Always low salt, very important for earthworms, always fast shipping, and the best price I can find online.
I saw Willys video (I'm a Patreon 20$ subscriber) talk about whats in this blend and compared to others I've used this stuff adds steroids to my flushes. My JF strain was so dense and full it was crazy. GT, same result. Enigma is almost ready for fruiting and thats the most challenging one for me right now. Its a slow colonizer and I'm anxious to see how Willys Blend kicked these into gear. Not one contamination in my first 4 grows ever since I started 10 weeks ago, on New Year's day. Willys techniques have been my protocols every step amd its amazing how fun this is! Midwest is my go to for most of my supplies. Mush Love Genetics is so good to me and offers Veterans discounts for their spores. All good 5 stars and 2 thumbs up for Willys Blend!
Got it, I don’t remember what day but you can see in the picture I’m including that it’s definitely working! When it’s ready I have a friend who I’m going to share with
Received 2 pre inoculated fruiting block and could already see mycelial growth. Cut a small window as directed and placed into fruiting tent. Photos are 14 days after receiving the blocks.
I love how well packaged your products are and my mushrooms are always beautiful.
I have been ordering all my supplies from here for a year now with no issues products are excellent
currently have about 18 of these jars going and all of them are colonizing quickly. i’m a pretty new to all this and have had nothing but success with these. will keep buying, wish they were a little cheaper. i included 3 pics , all different jars that fully colonized in 3 weeks
...but I'd buy it again at full price.
Funny thing is, I haven't dried any mushrooms with it yet. My last grow ended up with Trichoderma. I've got another grow started, though.
However, I've made several batches of jerky and the machine works great for that.
I took a chance and dishwashed the trays and it was no problem, no melting. They're pretty heavy duty plastic.
Now the temperature settings range from 95° to 158°. Technically, jerky is supposed to dry at 160 degrees, but Google AI said it was fine and I ate it, a lot of it, and didn't die.
Still looking forward to my first mushroom harvest.
This is so handy and you can make any kind of supplements!
The spore bags were sterile, created awesome yields and I will continue to use their products!
Ordered a few bags of 5-grain, shipping was fast, inoculated 9 days ago, everything is LOOKING GOOD!
THANK YOU🙏
Happy so far quick delivery, nicely prepared and after 12 days Mycelium is starting!
contamination out of the 12 jars i inoculated, their still going so can’t say mic about fruiting yet but would definitely buy again
I bought the light to sterilize my mushroom lab. I had a bad Smokey odor in the lab due to overcooked wood chips. This light somehow created ozone and now the smell is gone.
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.
