Answer: My approach is to prune a dogwood as little as possible. Past experience with them is that there is a direct relation between how prized and expensive they are and their willingness to die! Seriously, pruning can result in problems with cankers, so if significantly misdirected branches or broken branches necessitate removal, do so with sharp pruners, and dip the blades in rubbing alcohol between cuts. Prune immediately after flowering.
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