Answer: Crepe myrtles bloom on new wood, and cutting them back in late winter can stimulate additional branching and new growth. On the other hand, it destroys the natural shape of the plant, especially if it is being grown in the tree form. I believe it began as a method to control the size of the plants and then became a bit of a traditional thing to do. Annual cutting back is not a necessity. I hope this answers your question.
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