Casing Layer

What is a Casing Layer?

A casing should be a non-nutritious top layer that is placed over a colonized substrate, if you use a nutritious casing it will be colonized by the mycelium and then it will no longer be a casing. The purpose of a casing is to create a microclimate above the substrate to help induce pinning, it also supply moisture to the substrate and the developing fruits and prevents the substrate from drying out too quickly. The high-humidity microclimate helps to minimize side pinning by making the conditions at the top of the cake more favorable for fruiting than the sides.