Premium wild bird seed. Wild bird seed (WBS) is often used as a mushroom grain spawn. A common preparation method is to thoroughly rinse the seed then let it soak in water for 16-24 hours, drain it for 6 hours, then load into jars or filter patch mycobags for sterilization. Pressure cook for 90-120 minutes at 15 PSI.
Sold in ½ gallon increments.