Four 5-lb. Bags Wild Bird Seed Mushroom Grain Spawn Substrate Sterilized (20 lbs.) 0.2 Micron Filter Bag

  

These grain bags can be used to produce nearly any type of mushroom spawn. The bags are side-gusseted, extra thick (6 mil) and come equipped with a 0.2 micron breathable filter and self-healing injection port. In order to inoculate your bag you will need to obtain mushroom spawn, spores, agar or liquid culture (not included). It is always best to inoculate your bags asap.

If you are unable to inoculate right away, they should be used within 7 days. If you need to wait longer than 7 days i recommend you refrigerate them until you are ready.