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In general, you should notIn general, you should not prune trees in the fall, unless it is to remove damaged, diseased, or dead wood. Fall is a time when decay fungi are especially active. Also, pruning in fall (especially early fall) can encourage new growth, which may not harden off in time before winter's temperatures hit. You can prune some trees in winter, when the tree is dormant. In cold climates, late winter is best, but before the buds start to emerge. For flowering trees, it is best to prune spring-flowering trees immediately after they have finished flowering, before they develop next year's flower buds. Prune summer-flowering trees in winter or early spring.

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