Sterilised oat grain spawn and pasteurised CV Prime substrate for gourmet growers in the UK. Small batches, filter-patch bags, ships from the UK.
Grain spawnfrom £14.99
CV Primefrom $34.99from £19.99
Step 01 is live mycelium of the gourmet species you want to grow, and that part is yours. We make the two bags it runs through: sterilised grain to colonise first, and pasteurised CV Prime to fruit from.
1 kg oat grain spawn · 2.2 kg CV Prime · matched starter kitThe original MushRealm ACS recipe, the exact grain ACS runs in every grow: whole oats, fully hydrated, pressure-sterilised and sealed in a 0.2 µm filter-patch bag with a self-healing injection port.
The original MushRealm ACS recipe, the exact blend ACS runs in every grow: coir and vermiculite, pasteurised and hydrated to field capacity. Mix in colonised spawn and fruit straight from the bag.
One 1 kg oat grain bag and one 2.2 kg CV Prime bag, the 1 : 2 pairing our kits are built on.
The site shows one realm at a time so prices, weights and shipping are always right for you. Switch any time.
No autoclave, no pressure cooker. Everything arrives sterilised or pasteurised and sealed.
Add live mycelium of your chosen gourmet species to the grain through the self-healing port.
Let the mycelium run through the grain, then mix it into CV Prime at about 1 : 2.
Fresh air and humidity. Pins form and the mushrooms take off.
Pick at peak, rest the block for a second harvest, and log it in your Grow Dashboard.
Tell the planner how many tubs you are filling and how heavy you like to spawn. It works out the grain, the substrate and the cheapest way to buy it from the UK menu.
Open the plannerPlain-English guides from the MushRealm bench, from your first grain bag to your second flush. All guides
Grow oyster mushrooms at home on coir and vermiculite: colonise grain, spawn at 1:2, fruit from the bag and pull a second flush, with real temps and timings.
8 min readRead →Growing tutorialsSpawn to bulk made simple: 1:1, 1:2 and 1:3 grain spawn to substrate ratios compared, when grain is ready, a clean mixing method and a day by day timeline.
7 min readRead →SubstratesCV substrate is coco coir and vermiculite, pasteurised and hydrated. Learn why it works, which gourmet mushrooms grow on it, and when to buy it ready-made.
7 min readRead →Grain spawnWhat is grain spawn? How mushroom grain spawn is made, why growers use grain, and whether to buy sterilised grain or make your own, in plain steps.
8 min readRead →Gourmet mushroomsThe easiest mushrooms to grow at home, ranked: 8 gourmet species compared by substrate, temperature, days to first harvest and difficulty. Oysters first.
8 min readRead →ForagingMushroom foraging for beginners: the safety rules, the kit to bring, how to pick sustainably and how to learn a few wild edibles properly with local experts.
8 min readRead →Products, shipping, payment and the arrival guarantee. Still stuck? A real person answers every message.
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