All our pre-sterilized substrates are guaranteed sterile and ready for use with almost any kind of mushroom culture or spores. Get growing with Mushbox quality substrates.

Sterilzed Substrates

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These bags are for experienced cultivators only. If you want to start spawn and are a beginner then please try our half gallon jars of rye grain. Filled with approximately 2 1/2 pounds of organic rye.
Great for starting spawn for casing, bulk substrates or just as a master grain spawn. Made with precision and care.
Great for growing small scale inside of the bag or use to spawn to other colinized grains for larger flushes. Approximately 3 pounds.
A favorite substrate among mushroom cultivators for its ease of use and functionality. Filled with approximately 2 1/2 pounds of organic bird seed.
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