Small-batch grain and substrate, made properly
MushRealm Collective makes sterilized grain spawn and pasteurized CV Prime substrate for people who grow gourmet mushrooms at home. Every bag is prepared by hand in small batches, on two benches: one in California for the USA and one in the UK.
Why we started
We got tired of contaminated bags, mystery substrate and stores that went quiet the moment you had a question. So we built the opposite: a short line-up of products we use ourselves, prepared on a clean bench and backed by people who answer. No 400-product catalogue and no filler, just grain and substrate done well.
How we work
Grain is fully hydrated and pressure-sterilized. CV Prime is pasteurized and hydrated to field capacity. Every bag is sealed with a 0.2 micron filter patch, and grain bags get a self-healing injection port. Small batches mean fresher product and tighter quality control, and if a bag ever arrives contaminated or damaged, we replace it.
What we stand on
Clean prep
Sterilized grain, pasteurized substrate and filter-patch bags, every batch.
Small batches
Made fresh in rounds, never left sitting on a shelf for months.
Fast dispatch
Most orders leave in 1 to 2 business days, packed to survive the trip.
Real support
A real person answers every message, before and after you buy.
What we sell, and what we don't
We sell horticultural supplies for growing gourmet mushrooms such as oyster, lion's mane and shiitake. Our products contain no spores, cultures or genetics, and they aren't food. We don't sell or support growing any species that is controlled where you live. Read our intended use statement.
Business details
- Store
- MushRealm Collective
- US orders
- Packed in California, USD
- UK orders
- Packed in the UK, GBP
- Payments
- Card, processed by Stripe
Ready to grow?
Pick your bench, pick your bags, and a real person is one message away if you get stuck.
Shop the menu