A widely accepted rule of thumb is never to remove more than one-quarter of a tree’s leaf-bearing crown when pruning. In a mature tree, pruning even that much could have negative effects. Mature landscape trees must be pruned carefully because haphazard or ill-considered pruning causes injury, decline or even death. While younger trees use most of their energy for growth, older trees use most of their energy for maintaining live tissue. Just like humans that means not as much energy is available for growth and defense against decay.
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