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8-Pack Organic Sterilized Grain Spawn Bags
Certifications | USDA certified organic |
Moisture content | Hydrated to a target of 50% |
Carton size | 8 bags (24 lbs) |
Bag weight | 3 lbs each |
A $176 value!
Our best-selling organic sterilized grain spawn bag was formulated by mycologists to maximize the speed and size of your mushroom grow. (All that's required is a spore syringe or liquid culture!)
Each spawn bag contains our proprietary grain blend featuring hydrated, nutrient-rich, organic millet and wheat berries. Bags also include a self-healing injection port for use with a spore or culture syringe plus a 0.2 micron filter patch to block airborne contaminants while providing even gas exchange. (Note: Color of injection port may vary.)
Recommended add-ons
Spawn to bulk ratio
We recommended 1 lb of colonized grain spawn for every 5 lbs of manure or hardwood sterile substrate. We also recommend using 2.5-5ccs per 3 lb injection port bag. (See Inoculation and Colonization below for full details.)
Why millet?
Millet has a much lower endospore load than rye and wheat, making it less prone to contamination. And its small size means your spawn will have many more inoculation points for the same volume of grain. By using millet, the mycelium will spread more evenly and abundantly through the substrate. And, as a high-nutrient medium, it also encourages rapid mycelial expansion.
Sterilization
North Spore grain spawn bags are sterilized in a commercial-grade autoclave. Sterility is verified using biological indicators and temperature sensors.
Looking for single bags? Click here.
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To inoculate the grain bag, simply inject your spore or culture syringe through the port in a sterile location. We always recommend clean hands and latex or nitrile gloves to reduce the introduction of contaminants.
It is best practice to wait a minimum of 1 week after arrival before injecting grain bags to ensure they were not compromised during transit. Rest assured that your purchase is 100% guaranteed. If your bag was compromised, we will replace it.
We recommend using 2.5-5ccs per 3lb injection port bag. We do not typically recommend using an entire syringe in one bag. Doing so adds excessive moisture which can create over saturation in the bag. This over-saturation can pool and is prone to being anaerobic and the mycelium will have a hard time colonizing.
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Allow your bag to colonize in a cool location out of direct sunlight. Temperature for incubation shouldn't exceed 75 degrees F or dip below 55 degrees F. After a couple weeks, you should start to see mycelium growing on the grain.
You'll notice the white mycelium growing outward from the injection point. When it has grown three to four inches you should, without opening the bag, carefully break up the colonized grain and mix it into the uncolonized grain. This will dramatically speed up the colonization process.
When the bag is completely white with mycelium your spawn is ready to use. This may take a couple weeks to a month or more depending on the species and vigor of your culture.
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Grain bags should be stored at room temperature out of direct sunlight. No refrigeration is necessary. They can also be stored for several months before use.
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North Spore's products shall only be used for lawful purposes. North Spore does not condone hallucinogenic mushroom growing in jurisdictions where it is illegal.
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Review of Sterile Grain bags
These are the best spore bags, I am big grower and these are just the best on the market in terms of quality The price is perfect and anything cheaper you just lose to much quality, been down that road!
North Spore
Thanks for taking the time to share your experience, Cathy! We couldn't do it without customers like you! The team is here if you ever need anything!
Sterilized Grain Bags
Superb Product. Both species I've tried, recently, colonized extremely quickly; everything has been extremely healthy so far. Worth noting that the recommended cc can even be reduced (North Spore syringes must have very high concentration of spores). VERY excited for my next order/attempt!
North Spore
Thanks for sharing, William! We really appreciate you taking the time to share your experience. Our team is here to help if you ever need anything!
Organic Sterilized Grain Bag with Injection Port
Great experience! The bags shipped on time, arrived on time, were in good condition and as far as I can tell so far have no contamination issues! Thank you, North Spore, for another great customer experience!
North Spore
Thanks for the great review, Cody! We really appreciate your support.
Excellent product
All 8 grain bags in full harvest
North Spore
We're so glad everything is working out for you, Felix! If you need help with anything, please reach out.
AIO bags
Just inoculated 7 days ago. I’ll keep you posted on the progress
North Spore
Thanks for sharing, Leslie! Our team is here to help if you need anything.
First time buying
I prefer to buy in bulk and this is a great deal, all the bags looked great
North Spore
Thanks for sharing, Charles! Please reach out if you ever need anything.
Great
Great shipping Great product
North Spore
Thanks, Justin! We really appreciate your support.
Great product!
Grain bags came in a timely fashion with no contamination! Just recently inoculated and am eager to grow larger batches of lions mane and golden oyster.
North Spore
Thanks for sharing, Kristi! Our team is here to help if you ever need anything.
I have bought these as singles and a couple at a time. So happy I jumped to the bigger number. I have never had a bag of their sterilized grain be contaminated. Now that's a percentage we are looking for.
North Spore
Thanks for sharing, Kelly! Our team is here if you need anything!
Highly recommend!
I've used 4 of these so far and ever single one worked! If your new to growing your own mushrooms this is the best way to learn.
North Spore
Thanks so much, Dustin! Our team is here if you need anything!