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Soil depth
If bedrock comes close to the surface leaving only a thin layer of soil on top, or if there is little soil, consider planting only small or medium-maturing trees to help prevent large surface roots from forming.
If you choose to plant large-maturing trees on a site with little soil, select only those with non-invasive roots and relatively open canopies. Large-maturing trees in soil less than two feet thick could topple over in storms as they grow older because they lack deep roots.
