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Ready to Use Grain Spawn


  • Best Selling Grain Spawn

  • Sterilized and Ready to use

  • Self Healing Injection Port

  • Easy to Use

These grain spawn bags are beginner-friendly, extremely easy to use, and feature a self-healing injection port and a 0.2-micron filter allowing for fresh air exchange while eliminating airborne contamination.


Quickly incubate your spores or liquid culture with our sterilized grain spawn bags. These ready-to-use mushroom spawn bags are made using high-quality grains and supplemented ingredients. After soaking in a nutrient broth, these grains are set out to dry ensuring an ideal moisture content. Once dry they are packed in an autoclavable mushroom bag, sterilized for 2 hours, then cooled and sealed in a sterile environment under a HEPA flow hood.

Your mycelium will flourish!

How to use a mushroom grain spawn bag:

*Remove the bag from the packaging
*Unfold the bag and gently massage the bag to loosen the grain
*Wipe down the bag and all utensils with 70% isopropyl alcohol
*Inoculate your bag using a spore syringe via the self-healing injection port.
*Set the bag aside in a dry, dark place for 5-10 days with an average temp of 75-80F
*Gently mix up the mushroom spawn to promote full colonization.
*Once fully colonized the bag may be used to spawn to coir or any other bulk substrate

Each bag comes pre-sterilized and contains our best-selling grains to provide you with massive yields and rapid mycelium growth!

Looking for empty grow bags or organic rye grains? Shop our selection of mushroom grow bags here. Organic grain can be found here.

Note: Spores or cultures are not included. These bags are made to order. Please allow 3-4 days for processing before shipping.

Additional information

Grain Type

Oats, Rye


1.5 Pound Bag, 3 Pound Bag, 5 Pound Bag


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