Spring is the best time to prune butterfly bushes. Pruning in the late fall or winter leaves them susceptible to frost damage. Wait until the spring to do a hard prune (pruning it back to one foot ...
Outdoor Guide on MSN
Why Fall Is The Best Time To Prune These Summer-Flowering Shrubs
Some plants are already budding for spring, and don't need pruning. But these shrubs benefit from a light pruning in autumn.
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