Collection: Sterile Grain Bags

A sterile grain bag is a ready-to-inoculate bag of grains (e.g., rye or millet) that has been sterilised to remove contaminants. It’s designed to be colonised with your chosen mushroom culture to create spawn that can be transferred to substrate

Rye is a versatile, widely used grain for many gourmet and exotic mushroom species. Grains like millet and milo have smaller kernels, giving more inoculation points and often faster colonisation. We recommend choosing based on your strain’s growth behaviour, your preferred workflow, and the substrate you plan to use, for example, rye pairs particularly well with Masters Mix.

To use your sterile grain bag, just inoculate it via the injection port with a spore syringe or liquid culture, then let it grow! Once mycelium has fully colonised the bag of grain, you can safely call it grain spawn. Read more about using your sterile grain.

Unused bags typically keep up to 3 months when stored cool, dry, and out of direct light. For best results though, inoculate your grain bag as soon as possible after delivery.

We sterilise all our grains in bags inside our medical grade autoclave for 2 hours and 30 minutes, with a pressure of at least 15 PSI and a temperature of 121ºC. Then, we seal the bags in front of a laminar flow hood in our clean room to minimise contamination risk.

Yes! We automatically apply discounts on bulk orders of up to 200 sterile grain bags. If you're after a customer order or want a wholesale quote for sterile grain bags, then just contact us directly.