Using Spent Mushroom Substrate in the Garden

Using Spent Mushroom Substrate in the Garden

Turning waste into abundance — locally.

Spent Mushroom Substrate (SMS) is what’s left after mushrooms are harvested from a growing medium.

Our SMS comes from Ferg’s Fabulous Fungi, a local grower in Caldwell who’s helped many of us discover how mushroom compost can play a role in regenerative soil-building.