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Many research studies have confirmed that, without adequate soil volume and composition, trees won’t thrive. In fact, they’re unlikely to survive at all. While different species and different sites require different soil configurations, most urban foresters suggested a minimum of 500 cubic feet of non-compacted soil. Of course, this will vary by geography and site conditions, along with planting technologies [e.g. suspended pavements, pervious surfaces, tree trenches, etc.] Minnesota is one of the few states to issue clear guidelines on soil volume and composition. As part of their guidance, they reference similar standards from other communities.

State of Minnesota, Pollution Control Agency View Resource
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