This question recently arrived in our email inbox:
We have planted a number of shrubs at end of our property and fence line, including rose of Sharon, hostas, sand cherry, vines, lilacs, etc. We are in the planning stages of changing our back yard which is fairly small, and need to add soil to cover the roots of a linden tree which are growing out of the “lawn”. The question is can we add soil to the existing gardens without affecting the current shrubs and if so, is there a limit on how much. We are thinking we may need somewhere between 4-6 inches of new top soil.