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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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11/11/2020
Erik C.
5 of 5 Stars
This mushroom compost is excellent. However this is made, they do a good job. The substrate is colonizing nicely and with no issues or contamination. Also, we have had no problems with shipping or communication from this company. We would recommend others here who are in search of mushroom supplies. Great customer service and great shipping. 5 stars.
04/23/2020
Joseph C.
5 of 5 Stars
Best supplier on the internet got my package 3 days total I appreciate it so much and I will be ordering again very happy and I’m definitely recommending this to my friends and anyone who wants supplies to grow shrooms
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!

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