Grain Spawn is mushroom mycelium grown into certified organic rye grain which is ideal for inoculating sterilized substrates, or for use in unsterilized totem or bed-style inoculations. Grain spawn is the industry standard for high volume commercial production. We recommend using grain spawn within one to three months of purchase. Most species must be stored refrigerated, with the exception of Pink Oyster, which should NEVER be refrigerated (and used soon after receiving).
Grain spawn is used for Oyster and Shiitake mushroom cultivation.
One 4 lb. bag of grain spawn will inoculate about 40-80 lbs. of wet pasteurized substrate.