North Spore Organic Sterilized Grain Bag w/ Injection Port, 3 lbs

North Spore Organic Sterilized Grain Bag w/ Injection Port, 3 lbs

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USDA Certified Organic

Our sterile grain bag blend was formulated by mycologists to maximize the speed and size of your mushroom grow. Each spawn bag contains 3 lbs of our proprietary 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.


To inoculate the grain bag, simply inject your spore or culture syringe through the port in a sterile location. We also recommend 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. If your bag was compromised, we will replace it.


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.


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.