
Grain spawn
Fully hydrated milo grain, pressure-sterilized and sealed in a 0.2 µm filter-patch bag with a self-healing injection port. Inoculate the moment it lands.
Sterilized grain spawn, pasteurized CV Prime substrate and matched kits, packed on the USA bench. Pick a weight on each card, then add it to your bag.
Everything on the US menu: sterilized milo grain spawn in filter-patch bags with a self-healing injection port, pasteurized CV Prime substrate (coco coir and vermiculite at field capacity) and matched grow kits. New to this? Start with what grain spawn is, the spawn to bulk guide or how to grow oyster mushrooms on CV.

Fully hydrated milo grain, pressure-sterilized and sealed in a 0.2 µm filter-patch bag with a self-healing injection port. Inoculate the moment it lands.

The original MushRealm ACS recipe, the exact blend ACS runs in every grow: coir and vermiculite, pasteurized and hydrated to field capacity. Mix in colonized spawn and fruit straight from the bag.


One 3 lb grain spawn bag and one 5 lb CV Prime bag, matched for a single grow. No autoclave, no guesswork.
Same bench, same prep, different sizes. Bigger bags and kits bring the price per lb down.
| Product | Price | Per lb |
|---|---|---|
Grain spawn · 3 lb | $15 | $5.00Best |
Grow kit bundle · Double kit | $84 | $5.25 |
Grain spawn · 5 lb | $27 | $5.40 |
Grow kit bundle · Single kit | $44.99 | $5.62 |
CV Prime substrate · 10 lb | $59 | $5.90 |
CV Prime substrate · 5 lb | $34.99 | $7.00 |