Sterilized Mushroom Substrates & Grain Spawn Bags – Ready to Inoculate

Explore our collection of sterilized mushroom substrates and grain spawn bags, prepped and packaged for cultivators who want reliable results without the hassle of at-home sterilization. From nutrient-rich sorghum grain to fully hydrated bulk substrates like CVG, Master’s Mix, and hardwood blends, each product is sterilized and sealed to support successful colonization.

All grain and substrate bags are prepared in a controlled lab environment, using proven techniques to help minimize contamination risk and maintain ideal moisture content. Whether you're growing in monotubs, bags, or tent setups, these ready-to-use options simplify the process and support strong, consistent flushes.