When should a red maple be pruned?
Same bleed rule as the other maples, so structural work is easiest mid-to-late summer rather than late winter. The trap specific to red maple, and worse in 'Autumn Blaze', is that it builds tight codominant forks with included bark by years ten to fifteen — a five-minute subordination cut on a young tree prevents the trunk split that costs thousands later, so on anything under about eight inches DBH the actual job is structural training, not cleanup.
Reading red maple before you cut
Read the leaves before the crown: interveinal yellowing with green veins is manganese and iron chlorosis driven by high soil pH, and that is a fixable soil problem, not a death sentence. Genuine decline is outer-crown tip dieback with progressively sparser foliage, and if the trunk base is flattened with no visible root flare, a girdling root is the answer and the tree's remaining life is measured in a handful of years.
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