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Sterilized Rye Berries - Grain Spawn




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.

Sold in 1 lb. increments. 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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09/05/2019
Jacob C.
5 of 5 Stars
Was a little skeptical ordering these online . But for such a great price I though lets give it a try . Shipping was lightning fast to the Midwest . Extremely happy with service . Will update on colonization success.
07/16/2019
Zachary F.
5 of 5 Stars
Literally the best company, have gone above and beyond for me multiple times through the ordering process always speedy shipping, replying to emails with questions I’ve had. You guys rock seriously, and the grain spawn is great quality always fresh.
10/20/2018
Anne D.
5 of 5 Stars
These guys are awesome. Never had any problems with the grain spawn. Always fresh and fast shipping on product. Would recommend such a time saver.
09/15/2018
William H.
5 of 5 Stars
WOAH!! Y'all...........Fastest shipping times i've ever seen. These spawn bags are top quality. I will never use anyone else other than Shroom Supply. You all have the best customer service and are very friendly and informative. I can tell you really care about this hobby/passion and it shows in your products and service. Thank you, Shroom Supply!
02/19/2018
David G.
5 of 5 Stars
Quality product! The rye bags with the injection port...SO GOOD! These guys actually thought this through. I saw signs of growth only 5 days after injection! I am definitely ordering again! If anyone has any doubts you have no worries here. Shipping was fast and the price is amazing too! Thank you!
09/11/2017
Marshall U.
5 of 5 Stars
Luved them... 1st 2 times I tried to grow anything I had mold problems.. ordered the bag it came fast.. now I'm ordering the rest of wut I need to fruit.. best site ever

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