Level up your next run with a 3 lb Master Grain Spawn Bag—clean, vigorous grain that’s been inoculated with proven commercial strains and grown out from colonized agar plates for strong, consistent performance.
Each bag is fully colonized and designed to be a reliable “master” source for grain-to-grain (G2G) inoculation, helping you expand spawn efficiently while keeping your workflow streamlined.

What it’s for:
Grain-to-grain inoculation (G2G) to expand into additional grain bags or jars
Building larger batches of spawn from a clean, established starting point
Growers who want a dependable, lab-driven step between agar and bulk expansion

How it’s made:
Inoculated using colonized agar plates
Uses commercial strains selected for dependable growth
Prepared with sterile technique for a clean start and strong colonization

What you’ll receive:
1 × 3 lb colonized master grain spawn bag
Ready to use for G2G expansion upon arrival (no extra steps needed)

Shipping note:
Due to high local demand and inventory-based production, shipment times may vary. We’ll ship your order as quickly as possible based on current availability. Send us an email for the most up-to-date availability.