Sterilized Grain

Sterilized grain spawn, ready when you are. Each 3lb bag is autoclave sterilized and comes with an injection port and 2 micron filter patch, so you can inoculate with liquid culture without opening the bag.

Choose your grain: rye is the go-to for fast, consistent colonization. Sorghum (milo) has small, uniform kernels. Millet is a small grain that colonizes thoroughly. Popcorn has large kernels with plenty of surface area for aggressive growth. Whole oats are available too.

Not sure where to start? The Variety 3 Pack lets you compare rye, sorghum, and millet side by side, and the 3 Pack and 6 Pack lower the per-bag price. Free shipping on orders over $150.

Grain spawn FAQ

Which grain should I start with?
Rye is the most widely used and a good default. Different species and techniques can favor different grains, so the Variety 3 Pack is an easy way to find your favorite.

How do I inoculate a grain spawn bag?
Inject your liquid culture through the injection port. The filter patch lets the bag breathe while keeping contaminants out.

What's the difference between grain spawn bags and all-in-one grow bags?
Grain spawn bags hold sterilized grain only, which you use to expand a culture and spawn it to bulk substrate. All-in-one grow bags combine sterilized rye grain and CVG substrate in a single bag, so you can inoculate and fruit from the same bag.