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Pre-Pasteurized Mushroom Compost

Starting at: $4.95



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 six main ingredients including an organic compost specifically designed for mycological use, dehydrated horse manure, exotic zoo 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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Customer Reviews:

Displaying 1 to 6 (of 25 reviews)

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by John
I am in love with this substrate! Very fast and rhizomorphic colonization with this sub resulting in very large fruits! 👍🍄

Rating: 5 of 5 Stars [5 of 5 Stars]

by jimmy
Best bulk sub out there, well worth every penny. Always comes sealed and ready-to-use!

Rating: 5 of 5 Stars [5 of 5 Stars]

by Crucial
First time I have tried it and so far it's working like a champ. Also the mail drop the ball and lost my order but some how still delivered the package empty lol. I email the company they fixed it no questions thanks.

Rating: 5 of 5 Stars [5 of 5 Stars]

by Mike
Fastest shipping out of anything I've ever ordered off the internet. Fast colonization, will definately order again

Rating: 5 of 5 Stars [5 of 5 Stars]

by justin
This is an excellent bulk substrate. GIANT thick fruits. I mean huge. The flavor was so intense. I used only 1 of their sterilized rye bags and 4 pounds of this sub. It was fully colonized in less than a week. Didn't yield a whole lot bc of the ratio (instructions only call for 2.5 lbs. of compost but I used 4), but 9 mini shoe box tubs gave me produced over 20 Oz dry!

Rating: 5 of 5 Stars [5 of 5 Stars]

by [Your Name Here]
Tyson already said it all. Look no further. This is what you want.

Rating: 5 of 5 Stars [5 of 5 Stars]

Displaying 1 to 6 (of 25 reviews)

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