![BoomrBag Bulk Substrate](https://cdn.shopify.com/s/files/1/2016/2681/files/sterile-substrate-boomr-bag-manure-based-sterile-mushroom-bulk-substrate-29647046049894_204dc378-4c40-49f4-bb1a-125c7c3a82f3.jpg?v=1715225796?width=732&height=732)
Fulfilled by our friends at North Spore
Improve the yield of any dung-loving mushroom species with our best-selling Boomr Bag! This sterile bulk mushroom substrate is formulated by mycologists and features a proprietary blend of composted horse manure, coco coir, and several quality substrate supplements (although we keep the exact blend a secret!) Over several years, it has been perfected for a wide range of dung-loving mushroom species and is widely-trusted by mushroom growers. Note: Substrate is hydrated to field capacity.