Grain Spawn

Grain Spawn is mushroom mycelium grown into certified organic rye or millet grain which is ideal for inoculating sterilized or pasteurized substrates. Grain spawn is also the industry standard for high volume commercial production. We recommend using grain spawn within one to two months of purchase. Most species must be stored refrigerated, with the exception of Pink Oyster, which should NEVER be refrigerated (and should be used within one month of receiving).

One 4 lb. bag of grain spawn will inoculate about 80-100 lbs. of pasteurized straw substrate or 100-125 lbs. of sterilized sawdust.

Grain spawn is used for Oyster and Lion's Mane mushroom cultivation.

The more you order, the more you save (mix or match): the volume discount pricing below applies to large bags (4 lb.) of any grain spawn variety:

1 bag: $24.00 ea.
2 - 4 bags: $21.00 ea.
5 - 9 bags: $18.00 ea.
10 - 14 bags: $15.00 ea.
15 - 19 bags: $12.00 ea.
20+ bags: $10.50 ea.