My boys and I put together their gardens for the year. It was a cold operation in the 20-something degree temps, but they're pretty tough in all their bundled layers. My plan is to put down a few layers of cardboard, layer in all the woody debris in the yard, combine our very raw compost with as much biochar as I can make, and then fill the remainder with 2 year aged cow bedding pack. I may get some winecap mushroom spawn to mix into the more carbon based layers if the temperature is appropriate at that phase of construction.