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Organic Sterilized Grain Bag with Injection Port














Certifications | USDA certified organic |
Media | Organic grain mix |
Bag weight | 3 lbs |
Our best-selling organic sterilized grain bag was formulated by mycologists to maximize the speed and size of your mushroom grow. Each spawn bag contains 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. Note: Color of injection port may vary.
We recommended 1 lb of colonized grain spawn for every 5 lbs of manure or hardwood sterile substrate. (Higher inoculation rates may improve your success.) Be sure to mix colonized grain spawn thoroughly into your substrate. We also recommend clean hands and latex gloves to reduce the introduction of contaminants.
Need edible mushroom liquid culture syringes? 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 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.
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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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Our grain bags are sterilized in a commercial-grade autoclave. Sterility is verified using biological indicators and temperature sensors.
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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Great products! Fast delivery!
I have had a wonderful experience shopping with NorthSpore. The educational videos, blogs, descriptions are super helpful!

Easy to use
This made my first inoculation super easy.

Customer service made this product
I had some issues with one becoming contaminated, but with how nice Jason was, and how he gave me information in addition to the help I needed was exceptional. Love this company.

Excellent
I've used dozens of these grain bags from north spore with very few issues. They are my go to for when I'm too lazy or too busy. When I had an issue NorthSpore shipped me a replacement within 15 minutes of me emailing them. That kind of customer service is unrivaled in this hobby. I will forever reccomend NorthSpore.

Quality Spawn Bag
Fast shipping, good price for what you get. I haven't had any issues with contamination. Fast growth after inoculation. I highly recommend trying these spawn bags.