Organic Sterilized Grain Bag w/ Injection Port (3 lbs)

Save on Injection Port bags when you buy in bulk

Save 10% when you buy 4
Save 20% when you buy 8
Save 25% when you buy 12

Discounts will be reflected at checkout

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USDA Certified Organic

Our best-selling sterile grain spawn bags are formulated to maximize the speed of mycelium growth and contain a proprietary blend of hydrated organic millet and wheat berries. Each bag includes a self-healing injection port plus a 0.2 micron filter patch to block airborne contaminants while providing fresh air and even gas exchange.

Not only is millet nutrient-rich, it is less prone to contamination due to its low endospore load. The small grain size also provides more points of inoculation per pound of grain allowing the mycelium to spread more evenly and vigorously. 

Inoculation:

The self-healing injection port works with a spore or culture syringe. To inoculate the grain bags, simply inject through the port in a sterile location wearing latex gloves.

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.

Colonization:

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.

Storage:

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.

Made by Expert Mycologists:

With a vertically integrated spawn facility and team of trained mycologists, we provide premium mushroom supplies to innovative growers. Through years of research and development we’ve created the best sterile mushroom substrates on the market.

New To Mushrooms?

Watch this video to learn how to use grain bag! Or, click here for a more-detailed mushroom growing walk-through.

 *North Spore's products shall be used only for lawful purposes!