I am making some
hugel trenches about 5 inches down, filling in with
native top/subsoil then covering the whole area with a few inches of
compost. So anywhere from 4-8 inches below surface.
I ran out of brush and logs to fill it all the way up, so I pruned some of our invasive Eleagnus (I think it is E. umbellatus), and I am wondering if these fresh trimmings will send out shoots.
That would not be cool as I am trying to grow edibles above the buried biomass.