It depends on the shrubs being planted, but generally, there should be at least as much topsoil as the rootballs on the shrubs. Trees require a minimum of 2 feet and a maximum of 3 feet of soil for proper root development. Large shrubs should be provided with a similiar depth. Small and medium shrubs should be able to get by with 1.5 to 2 feet of soil.
As top soil is the upper surface of the Earth’s crust, it only reaches about 20cm (8 inches) deep. However, it depends on where you are located.
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