The best time to prune rose of Sharon is in late winter or early spring. By pruning at this time, you avoid plant diseases and don't risk losing flower buds, which haven't formed yet. Rose of Sharon ...
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How to Plant and Grow Rose of Sharon

Rose of Sharon is a shrub or small tree that blooms with abandon from midsummer until frost. Rose of Sharon (Hibiscus ...
An unsung hero of the late summer garden is rose of Sharon (Hibiscus syriacus). This shrub's branches are studded with pastel blossoms year after year, despite drought, poor soil or general neglect.
A: Just after the March freeze, mine did the very same thing. Let Mother Nature take care of them. More new growth will push those crunchy leaves off the plant. Same with some others, like loropetalum ...
Prune rose of Sharon in late winter or early spring—this avoids disease and protects summer blooms. Pruning shapes the plant, improves airflow, and can rejuvenate older bushes if cut back heavily.