If you've ever planted a tree in an urban environment you'll know how scarce, and therefore how critical, the rootzone area can be for healthy tree development.
There's a very good chance that any tree pit will be surrounded by concrete and other impermeable layers making it difficult for new trees to sufficiently establish; and therefore go on to thrive, or at least be sustained to remain healthy.
Greemleaf has designed a soil calculator for when planning tree planting in urban areas.
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