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Pre-Pasteurized Mushroom Compost

Starting at: $5.95

Please Choose:

Pre-pasteurized premium bulk substrate mushroom compost in a gusseted autoclave bag with filter patch. Shroom Supply mushroom compost is specifically formulated for growing mushrooms. It is free of any additives or chemicals and is to be used in conjunction with our mushroom grain spawn.

This choice bulk substrate is composed of five main ingredients including an organic compost specifically designed for mycological use, composted horse manure, organic coconut coir, vermiculite, and gypsum. This diverse blend of unique ingredients provides the perfect amount of nutrition for optimal mycelial growth, making it the ideal growing medium for mushroom cultivation.

Our premium mushroom compost comes pre-pasteurized and hydrated to the perfect moisture content, making it ready to use right out of the bag. Simply add colonized grain spawn, mix, and add to your fruiting chamber or grow bag. We recommend using two pounds of our grain spawn for every five pounds of compost. Once the substrate is fully colonized with mushroom mycelium, our casing mix can be applied in a thin layer to the top of the substrate. Please note that a casing layer is not required, but rather an optional ingredient that can benefit the growth of certain mushroom species.

This product comes heat-sealed in sterile, filter-patch mycobags and can be stored at room temperature for up to 14 days. If more time is needed, it can be stored in the freezer and dethawed before use.

All mushroom compost comes packaged in 5 lb. increments.

Made to order, usually ships within 2 business days.

Instructions: Bulk Substrate Tutorial

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Sean L.
5 of 5 Stars
Professional product from a professional company! Thank you!
Ash R.
5 of 5 Stars
What can be said that has Not Already been professed about this company and there attention to EVERY DETAIL. This compost has NEVER let me down.. ALWAYS arrives Completely STERILE and the automatic and accelerated growth is seen taking hold in under 24hrs of combining with spawn. Not to mention it has dramatically increased BOTH mushroom size and harvests. Has all the nutrition your mycellium projects require from first flush to the last. Very professional personnel with amazing tech support and Very Quick Responses should anything arise. The ONLY company I will EVER purchase from. Mush Love and THANKS for everything Fam Ash
anthony g.
5 of 5 Stars
Shrooms Supply you guys are a life saver. Saved me a lot of time and hassle. Tyvm!
andrew D.
5 of 5 Stars
Hands down my most favorite product on this site, perfect moisture content and I love how it's so nutrient rich and ready to go straight out of the package. For peace of mind and astounding colonization you cannot beat the price! MushLove for the shroom supply! Ten stars out of five!
5 of 5 Stars
Look-- Im a hard critic of online businesses. But i cannot find one reason to minus a star from these folks. I started with the A+ kit just to get a feel of what they supply. I also had a few questions along the way that were promptly answered by customer service. The result so far has been 3 AWESOME flushes from the same original substrate. Im more than pleased. And have already highly recommended shroom supply kits to my friends. I realize that there are many different teks out there. But if youre looking for convenience and discreetness of set-up, shroomsupply kit bags are the way to go. At any rate- could go on and on. Place an order for yourself and relax :-)
5 of 5 Stars
Excellent substrate that provided huge yields and massive fruit.

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