Uncle Myc's Rye Berry Grain 100% Sterilized Mushroom Spawn Bag

A weak or contaminated spawn bag sets back an entire grow before it even starts, which is why the quality of your starting grain matters more than most cultivators realize. Uncle Myc's Rye Berry Grain 100% Sterilized Mushroom Spawn Bag gives both beginners and seasoned growers a reliable foundation, using rye berries carefully sourced and hydrated to the ideal moisture level. For those who prefer a smaller grain size for more inoculation points, the Uncle Myc's Millet Grain 100% Sterilized Mushroom Spawn Bag is an excellent alternative.

Every bag is professionally sterilized rather than pasteurized, eliminating competing organisms before it reaches you and creating genuinely optimal conditions for mycelial growth from the moment you inoculate. Rye's larger grain size and dense nutrient content make it a versatile choice, well-suited to a wide range of gourmet and medicinal mushroom species.

Once colonized, rye's sturdy structure holds together well during break-and-shake steps, giving you an even, high-vigor spawn that's easy to work with when it's time to transfer to a nutrient-rich Uncle Myc's CVG Supplemented Bulk Substrate. Available in 2lb and 4lb sizes, it scales cleanly from a single grow to larger multi-bag operations without any drop in quality or consistency.