Uncle Myc's Millet Grain 100% Sterilized Mushroom Spawn Bag

Slower colonization means more time for contaminants to gain a foothold, which is why grain size matters more than most growers realize. Uncle Myc's Millet Grain 100% Sterilized Mushroom Spawn Bag uses millet's naturally small grain size to create significantly more inoculation points per bag, driving faster, denser colonization than larger grains like Uncle Myc's Rye Berry Grain can offer.

Every bag is professionally pre-sterilized rather than pasteurized, giving beginners and experienced growers alike a genuinely contamination-free, ready-to-use starting point. The grain is hydrated to the ideal moisture level before packaging, so the mycelium has immediate access to the nutrients it needs without any risk of over- or under-hydration throwing off colonization.

Once inoculated, that dense network of small grains translates directly into a stronger, more uniform spawn mass — which means better substrate coverage and more consistent colonization when it's time to transfer your mycelium to a nutrient-rich Uncle Myc's CVG Supplemented Bulk Substrate. Available in 2lb and 4lb sizes, it's built to scale from a single grow to larger multi-bag operations without any drop in colonization speed or consistency.