good question....
About 7 yrs ago started my soil from river silt, finally ground mountain dust, no organics. No "soil" a gardener would recognize around here. Started making humanure compost with, yeah, our poop and whatever will quickly decomp. Leaves, grass, fish waste, any so-called "weeds" growing around camp. Starting to get decent "garden soil". I mix a little organic ferts into the base soil, mulch lightly with compost and bloom boost organically starting with pre-flower. My flow chart....
View attachment 1045935 compost pile to raised garden bed to greenhouse.