Answer: I'm unable to suggest a tree that will reliably fit the dimensions you give. It's possible to contain the roots of a tree, such as a Leyland Cypress, to reduce its ultimate size, but that would require periodic unpotting and root pruning. May I suggest a large shrub trained into tree form? You'll have the beauty of multiple trunks along with a dense, green canopy of leaves. If this appeals to you, consider camellia, Cercis (redbud), Chamaecyparis (thread-branch cypress), or Viburnum. Hope the above information is helpful!
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