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In respect to this, what is the best potting soil for trees?
Use a nursery blend planting mix recommended for trees and shrubs. Garden soils or commercial top soils are too heavy when used alone; organic material or peat moss should be mixed in. You may pot in peat moss only but plan to fertilize every two weeks rather than every month.
Keeping this in view, can you use potting soil for trees?
Soil for Trees. For a successful tree and shrub container garden, you need to provide your plants with the proper growing medium, such as Soil3 organic humus compost that can be used directly as both potting soil and fertilizer for your trees.
Tree soil should have a minimum depth of 3 feet (1 m). The soil can be composed of topsoil and subsoil layers. When installing the soil it should be installed in lifts or layers of < 12 inches (30 cm).