Each order comes with (5) 3lb bags [15lbs total per order] Grow Mushrooms at Home or at Scale—19 Varieties Available Our lab-crafted grain spawn is made with a sterile blend of non-GMO red sorghum (milo) and limestone (calcium carbonate) colonized by active mycelium for reliable and productive mushroom cultivation. Choose from 19 popular varieties, including Lion’s Mane (Hericium erinaceus), Turkey Tail (Trametes versicolor), Blue Oyster (Pleurotus columbinus), Shiitake (Lentinula edodes), Chestnut (Pholiota aurivella), and many more. Whether you’re a hobbyist grower or scaling up for commercial production, our spawn is ready to help you start your next flush.