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5lbs. Organic Wood-Lover Substrate

High-yield, supplemented sawdust mushroom substrate

A 5lb. bag of hydrated, sterilized organic rye grain in an injection-port spawn bag, ready to inoculate with the mushroom culture of your choice.

Our hardwood-based substrate is lovingly mixed by hand in small batches using only wholesome, natural and organic ingredients. High in nitrogen and packed with nutrients, this supplemented sawdust recipe is formulated for wood-loving mushrooms to maximize biological efficiency and keep the mycelium thriving for many consecutive harvests.

Perfect for both indoor and outdoor mushroom cultivation projects, sawdust spawn is versatile. It can be used as a stand-alone "fruiting block" for simple, small-scale mushroom cultivation (this is the base of all our wood-loving mushroom kits), and it can also be used for starting mushroom patches, inoculating logs or spawning into bulk substrates.

Ingredients: Spring water, wild alder sawdust, organic wheat straw, organic worm castings, organic coconut coir, vermiculite, organic wheat bran, gypsum, chalk, potash.

The specialized injection-port spawn bags make it easy to inoculate your grain with a liquid culture syringe. The 0.2 micron sir filter keeps it sterile while it incubates. Once the mycelium has a running start in sterile conditions, mature grain spawn is naturally resistant to contamination and can be handled directly for spawning bulk substrates like sawdust, wood chips, dowels and straw.

Make it a kit! Get a discount when you include a Fungaia liquid culture syringe with your substrate, or check out our all-in-one kits for growing Lion's Mane, Reishi, Oysters and more.

Organic Matters

Mushrooms bioaccumulate toxins at many times the ambient levels of their environment. While this is good news for our soils, it's not for our bodies. With ever-increasing concentrations of pesticides and other toxins in our soil, food and water, it's more important than ever to find sources we can trust. 

At Fertile Substrate, we are meticulous about our ingredients, from our spring water to the wood we burn for our homemade potash pH booster. We believe that every detail has significance, and we are dedicated to our craft. It won't be hard to see the difference, and we promise that your fungus will thank you, too.

Our Guarantee

We guarantee that your substrate will arrive intact and free of contaminants or we will replace it. Once it has been inoculated, this gurantee only applies if you use a liquid culture from Fungaia.