Answer: Rose of Sharon, Hibiscus syriacus, may be cut back in late winter or very early spring before the new growth begins. Remove any winter damage, and then trim to shape as needed. The plant can also be renewed by cutting it back very hard. The amount to prune is a matter of personal taste; the bush can be left to grow into a small tree or sheared as one would a hedge. It blooms on new wood of the season, so should not be pruned when in active growth as this will remove flowering wood.
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