Your Next Grow Starts Here

Quality grain bags, pasteurized substrate, and mushroom-growing supplies—all in one place. From your first grow to your next big project, aPlusGrain has the supplies you need and the support to help you along the way.

Shop Growing Supplies

Sterile Grain Bags

Find your preferred grain in the size and quantity that fit your setup. Our prepared grain bags make stocking up for your next grow simple.

Pasteurized Substrate

Give your colonized grain its next home. Choose from our substrate blends and quantities to find the right fit for your grow.

Grain & Substrate Bundles

Get your grain and substrate together in one convenient purchase. Clearly listed contents make it easy to choose a bundle that works for you.

All-in-One Grow Bags

Simplify your setup with grain and substrate combined in a single grow bag.

Bags, Ports & Grow Supplies

Preparing your own materials? Stock up on empty grow bags, injection ports, and other cultivation essentials.

A Small Business Behind Every Bag

Since 2019, aPlusGrain has taken a hands-on approach to making grain and substrate bags, with a focus on quality, dependable service, and personal support.

Whether you’re just getting started or have years of growing experience, we’re here to make choosing your supplies easier. Have a question about a product or your setup? Reach out for free guidance—we’re happy to help.