HOW MUCH TOPSOIL?
Annuals & Perennials & Vegetables require topsoil one foot deep. Tree & Shrub beds need only the soil in the planting hole amended. There is no sense in putting a foot of topsoil over these beds completely, since the tree or shrub will eventually grow down into the existing soil. What you want is to ensure is that the plant gets a good head start in growing so that it is robust once it’s roots reach the existing soil – whatever kind that may be! Lawns require 6″ of topsoil.
