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Sterilized Rye Berries - Grain Spawn

Starting at: $6.95

Sterilized and prepared mushroom grain spawn substrate in a gusseted autoclave bag with filter patch. Gourmet Mushroom Supply grain spawn is composed of 100% USDA certified organic rye berries which is widely regarded as the highest quality grain for spawn production and is the industry standard for mushroom cultivation. The substrate is free of any additives or chemicals and is recommended for use with our pre-pasteurized mushroom compost.

Once colonized with mushroom mycelium, we recommend using the colonized grain spawn to inoculate a bulk substrate, like our premium pre-pasteurized mushroom compost. We recommend spawning two pounds of our grain spawn to five pounds of our compost. Alternatively, the colonized grain spawn can be transferred to more sterilized grains to promote further propagation of the mushroom mycelium (also known as a grain to grain transfer).

We prepare our organic rye berry grain spawn by thoroughly rinsing the grains, then soaking them for a full 24 hours in a gypsum-fortified water bath to ensure optimal moisture and mineral levels. The rye berries are then sterilized at 15 PSI in a lab-grade autoclave for a complete 120 minutes.

Our grain spawn comes heat-sealed in sterile, filter-patch mycobags and can be stored at room temperature for up to 21 days.

All grain spawn comes packaged in 1 lb. increments.

Made to order, usually ships within 2 business days.

Instructions: How to inoculate sterilized grain bags

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