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🍄 Grow like a pro—sterile, speedy, and stress-free spawn bags for the modern mycologist!
North Spore’s Sterile Grain Bag is a USDA certified organic, 3-liter spawn bag formulated by mycologists with a proprietary millet and wheat blend. It features commercial-grade autoclave sterilization, a self-healing injection port, and a 0.2 micron filter patch to prevent contamination while allowing gas exchange. Designed for fast, large mushroom yields, it’s perfect for professional and hobbyist growers seeking reliable, ready-to-use spawn.
| ASIN | B0B4X6NRVR |
| Best Sellers Rank | #10,745 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #31 in Plant Grow Bags |
| Brand | North Spore |
| Date First Available | June 23, 2022 |
| Global Trade Identification Number | 00869275000289 |
| Item Form | Bag |
| Item Weight | 3 pounds |
| Item model number | EQUIP-INJECTBAG-3LB-V2 |
| Liquid Volume | 3 Liters |
| Manufacturer | North Spore |
| Number of Items | 1 |
| Package Dimensions | 6.54 x 5.24 x 5 inches |
| Specific Uses For Product | Mushroom cultivation |
| Unit Count | 48 Ounce |
A**M
Trustworthy Bag
Self healing injection port is working solid, no contams 3 weeks post injection- which also points to the fact that they autoclaved this thing well. It's been well over a month since I got it and that means it's probably been a month and a week since it was packed. The price is a steal for the work I avoided, and considering how little output I do it's just easier. North Spore is solid and they've been in the game for years, I wouldn't shave off a couple dollars to get a version that I would even have to worry about mold with. It was good to go out of the box, just unfold it gently and don't get your filter wet. I don't know if it's waterproof, I always assume no. Oh, no big moisture spots or visible dryness either if you're worried about that.
J**B
Great Quality Spawn Bag – Perfect for Growing Lion’s Mane
This sterilized, hydrated grain spawn bag worked perfectly for my lion’s mane mushroom grow! It arrived well-sealed, clean, and fully hydrated—ready to inoculate right out of the box. Colonization was fast and even, and I got a great yield. Super convenient and reliable for home cultivation. Highly recommend for any mushroom grower!
C**W
I trust North Spore. Plain and simple.
Haven't had a problem with a bag yet! I've been able to colonize and spawn to bulk with every single one. I will say this, North Spore is a brand i trust. There's plenty of other bigger and cheaper grain bags on here..but I know this works, it's clean, and if there is ever a problem, North Spore will take care of it. Not if you inoculated and nothing grew...im talking about if the grains don't look right, the bag isnt vacuum sealed, or it smells bad. Quality is 10/10. It does its magic thing every single time :)
J**N
Only bags I'll purchase!
I recently tried the North Spore 3lb bag of sterilized grain, and it has been a great addition to my mushroom cultivation setup. The grain arrived in perfect condition, well-packaged, and ready to use right out of the bag. The sterilization was spot-on—no contaminants, which is crucial for a successful grow. The quality of the grain itself is impressive; it's consistent and works well with my mushroom spore syringes. Overall, this product offers excellent value for the price and performs as advertised. Highly recommend it for anyone serious about growing mushrooms at home.
J**H
Horrible!
Do not waste your money! I am highly disappointed with their grain spawn. This is my first time ordering, I decided to give them a try because their name is everywhere and thought it would be a good purchase, well I wish I would have looked at the negative reviews more. The grain that arrived was completely dry, no moisture whatsoever. I inoculated the bag and after two weeks, nothing! I used the same syringe and inoculated a bag from spawntek and boom! Mycelium growing within two days. Save yourself the trouble and find elsewhere. I hope they do the right thing and refund this product
T**E
Excellent
The only grain I will buy. Nice and tightly packed with fresh hydrated and sterile millet. I inoculated it with a spore syringe from a reputable supplier. Set the temp to 77, and let it sit in the dark cozy closet. I was careful to minimize possibility of contam. Sprayed the bag all over w alcohol first thing. Applied fire to the syringe. Sprayed the grow room w isopropyl alcohol too. You cant do too much sterilizing. Use sterile gloves if you have them. Mycelium noticeable in a week. Spreads rapidly. After the second week, I had about 2 pounds of pure, fresh fluffy mycelium. Went on to grow the biggest flush ever in a monotub. Happy growing!
E**T
Poor Seal (But Good Grain...)
the grain was sterile but during the routine inspection, the bag ripped at the seam and spilled grain. this is a poor quality bag.
J**.
Mostly sterile!
I found the moisture content to be good, the mycelium seems very happy so far, and I waited a couple weeks before inoculating to ensure they came sterile. The product received 4 stars instead of 5 only because one of my eight bags came contaminated and has an interesting fungus growing in it thus preventing me from safely inoculating that bag. 7/8 is pretty good though! And I’ll get myself a pressure cooker and an autoclave one day when I can afford upgrading my equipment for at-home sterilization. All in all I was very pleased with my first grow! *I did not contact north spore regarding the one contaminated bag. Maybe they would replace it, but there’s no solid promise in the product description of replacement, so I chose to take on the loss. 🤷♂️*