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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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03/18/2021
Rene I.
5 of 5 Stars
This Is the Best! went with the MW Grow kit brand 2 grows back and those bags were a waste of "TIME & and Money"! mostly TIME... big mistake! i wont order from anywhere but Shroom Supply in the future!!!
12/11/2020
Rene I.
5 of 5 Stars
Best BAGs Out There, left to try other brands but they failed! So Im back and never leaving... Sorry Shroom Supply!
11/11/2020
Erik C.
5 of 5 Stars
This grain spawn works great. No issues with contamination or colonizing. This company is professional and knows what they are doing. We will continue to use this website for future orders. Fast shipping and good communication. We would recommend others here who are in search of mushroom supplies. 5 stars.
08/24/2020
Christopher O.
5 of 5 Stars
I purchased about 5 of these bags and only used 2 to start. Im running an experiment right now and have knocked up another bag 4 months later! So far so good knocked up maybe a week or less ago. I didn't know if there was enough moister or what not left in the bag but it looks like the spores like the home. I also kept them wrapped up and in a bin stored in my closet to try and keep as much contaminated off the bag and kept the FILTER as much as i could away from open air etc. I know have a pc so i made my first jars of grain with popcorn so i won't need to buy these bags as often anymore but def worth the 7$ if its your first time growing great way to have a successful first run and many more! Love this site so much!
06/30/2020
Kenneth B.
5 of 5 Stars
I had a grain bag busted opened when I got it emailed the next day I had a new one on the way , that’s customer service at its best thanks Shroom supply I never order any where else
06/03/2020
Mary H.
5 of 5 Stars
Fast Shipping, great product, and no contamination. Would definitely buy again!

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