Mulch

Mulch is an item introduced by Forestry. Mulch is very common in several important crafting recipes in Forestry, such as the crafting of Humus and Bog Earth. It can also be inserted in a Fermenter to create Biomass.

Hummus a block used in creating automated tree farms. On the other hand Bog Earth and Biomass are both used to create power. Bog Earth can be used to create Peat which is a fuel source for Peat-Fired Engine.

Recipe
Mulch may be produced in the Moistener by cycling Wheat. The inputted wheat will continually cycle to follow the process of Wheat → Mouldy Wheat → Decaying Wheat → Mulch.

Mulch also has a 40% chance of being created as a byproduct of squeezing an Apple in a Squeezer.

Finally mulch has a 5% chance of being created as a byproduct of squeezing a Walnut or Chestnut is a Squeezer.