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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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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
08/28/2017
David H.
5 of 5 Stars
These bags are WAY WAY better than any other pre-made spawn jars or bags I have ever used. Great price & Super fast shipping. Top Quality....Shroom Supply is my go-to for all my myco needs.
08/18/2017
andrew D.
5 of 5 Stars
If you have even the slightest doubt in your own grain prep and want to ensure that nothing goes wrong with your prized genetics, or plan a grain to grain transfer with one of you're favorite species then look no further for peace of mind and quality. Even experts can benefit from the ease and trusted sterilization that is Ryans perfected method. I have yet to see a comparable product with this high of quality in packaging and product on any site I've tried. Not to mention the customer service and shipping is outstanding and fast! Ryan is the man! Worth every penny! MushLove
03/29/2017
Gucci mane
5 of 5 Stars
A bit pricey, but very pleased with this product. Great costumer service as well.
02/21/2017
DARNELL
5 of 5 Stars
Extremely fast shipping I ordered it on the weekend and got it in 2 days great stuff yall

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