Sterile Grain Jars

Premium Sterilized Grain Mix

Each 32 oz jar comes packed with 1 lb of fully hydrated milo, balanced with oyster shell and gypsum. This nutrient-rich blend promotes rapid colonization, stable pH, and strong mycelial development—giving your grow a clean and reliable start.

• Milo (sorghum): Small, round grains that stay loose and shake easily, helping mycelium spread quickly.
• Oyster shell: Provides calcium and helps stabilize pH, creating a balanced environment for growth.
• Gypsum: Prevents clumping, keeps grains hydrated evenly, and supports strong colonization.

Advanced Sterilization & Hydration

Every jar is sterilized in industrial autoclaves and hydrated to the ideal moisture level. Delivered pre-sterilized and sealed, they’re ready for immediate inoculation with spores or liquid culture.

Built-in Injection Port & Filter

Each lid features a self-healing injection port and a 0.2 μm gas-exchange filter. This setup allows for quick, contamination-resistant inoculation while maintaining fresh airflow for healthy growth.

Versatile for Many Mushroom Types

Perfect for gourmet species and medicinal varieties. Colonized jars can be used as grain spawn for bulk substrates, monotubs, or grain-to-grain transfers.

Durable & Secure Packaging

Made with 32 oz wide-mouth glass jars and fitted with sturdy metal lids, they hold up to shaking and repeated handling. Each jar is bubble-wrapped for safe delivery and stores for months at room temperature without refrigeration.