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Sterilized Rye Berries - Grain Spawn

Starting at: $7.95

Please Choose:

Sterilized and prepared mushroom grain spawn substrate (1 lb.) in a gusseted autoclave bag with filter patch and self-healing injection port. Shroom 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 18 hours in a gypsum-fortified water bath to ensure optimal moisture and mineral levels. Immediately after the soak, the rye is simmered for 10 minutes in distilled water. 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 a sterile, filter-patch mycobag with injection port and can be stored at room temperature for up to 14 days before use. If longer than 14 days is needed, the grain can be stored in a clean container in the refrigerator for up to six weeks. Do not freeze.

All sterilized grain spawn will come packaged in individual 1 lb. bags, regardless of quantity ordered.

Made to order, usually ships within 2 business days.

Instructions: How to inoculate sterilized grain bags

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5 of 5 Stars
The discreet package was delivered on time as expected.
Zac S.
5 of 5 Stars
These guys are the best in the business, no doubt about it! Perfect product every time, with extremely fast shipping. Like they say if they don't have you don't need it 100% true.
5 of 5 Stars
By far the best bags out there. These guys do it right. If you want the best you have found it. Dont waste any more money on bags that are trash. Buy these bags and do yourself a favor!!!!!!!
5 of 5 Stars
Ordered two lbs. of grain spawn and the quality of the product is up there with the best. Discreet shipping, and my package was delivered one day early!
5 of 5 Stars
Please don't be fooled by the other pricey gimmicks. This is thee ONLY company I will Ever order from. It is a miracle to have found you guys, and I will NEVER Switch up. Was a straight BRF guy until Ryan recently and very EASILY changed my mind. Quality prodicts. And even better, personalized and Very Knowledgeable help and information if ever needed. That was my selling point to be honest. Thanks again
5 of 5 Stars
I've been using these grain bags for over a year now and have consistent success every time. If you're trying to cultivate mushrooms this is the way to go. Thanks shroomsupply!

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