Soil is ploughed or paved to 9 or 12 inches of depth below and left open to dry (die). Land needs to be covered under tree shade so that it doesn't become dry. It needs to have those dead yellow leaves on top of it to cover it in the sunlight, not to be swept off in the gardens you play around. Land needs to be below grasses, trees, herbs, bushes to have the organic content which keeps it alive.