Uncle Myc's CVG Supplemented Bulk Substrate

It's a blend of coco coir, vermiculite, and gypsum that's sterilized in certified autoclaves rather than just pasteurized. This gives your mushroom cultures a cleaner, more contamination-resistant starting point than typical bulk substrates.

Pasteurization only reduces competing organisms, while autoclave sterilization eliminates them entirely. That extra step means fewer contamination issues and more reliable colonization across every batch.

No. The substrate is ready to use straight out of the bag — simply open it, mix in your spawn, and you're ready to grow with no additional pasteurizing or hydrating required.

This substrate is compatible with all gourmet and medicinal mushroom species. Its balanced nutrient and hydration profile supports vigorous mycelial growth regardless of the strain you're cultivating.

The 2lb bag works well for small test batches or single-tub grows, the 4lb size fits most standard home setups, and the 8lb bag suits growers running larger or multiple containers at once.

This substrate is designed to be supplemented with colonized grain spawn rather than used alone. Mixing it with spawn allows the mycelium to spread through the nutrient-rich blend and drive strong fruiting.