“What is the best way and time to prune a Rose of Sharon?” Question from Rick of Roseville, California
Answer: Rose of Sharon (Hibiscus syriacus) is a quite forgiving shrub when it comes to pruning. It blooms on new wood, so you can prune in the spring or later in the season. It’s your preference. This is a shrub that should not be sheared. Simply shape it by selectively removing tall, out-of-place, or awkward branches that are keeping it from looking uniform. Also, be sure to remove any crossing or old stems as well as deadwood.
This shrub tends to be weedy, which is why I also advise planting a double-flowered variety, like those on the Chiffon Series, which produce little to no seed.
Black Gold Horticulturist