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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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01/15/2020
Ambar b.
5 of 5 Stars
My packaged arrived super quick but usps rough handled my package and made a tear in the substrate and box I provided them with picture and Ryan made everything right and sent out a fresh batch of substrate the very next day I definitely will be picking up from them from now on thank you for you time and service ????????
09/07/2019
Brendon M.
5 of 5 Stars
This sub is spot on. Side to side comparison proves it. Fast colonization, perfect field capacity. Very contamination resistant.
07/16/2019
Zachary F.
5 of 5 Stars
Simply amazing, beyond grateful for this company. Love this substrate, ready to go and superior quality.
09/15/2018
William H.
5 of 5 Stars
I don't usually write reviews unless i'm blown away, and...well....this is top quality. I wrote a similar review on your spawn bags but the same goes for this product. it was packaged neatly and is very high quality. Have not used yet, but you can just TELL from looking at these bags that they are the "ones". 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!
03/14/2018
Sean L.
5 of 5 Stars
Professional product from a professional company! Thank you!
02/14/2018
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

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