when is best time to trim rose of sharon and how much can you take off. Mine is rather large and I am tempted to cut it well back?
Thanks for your inquiry.
Here’s a rule of thumb for pruning shrubs: Prune spring flower shrubs immediately after blooming. Prune summer blooming shrubs in early spring before growth begins. Then prune to remove spent flowers that have bloomed. Never remove more than 25% of the shrub at one time.
Rose of Sharon (Hibiscus syriacus) is a summer blooming shrub. If you prune it now, you will lose the flowers for this year. If it is very large and something needs to be done now, you can thin it out by removing some of the branches. Once the shrub has bloomed remove the spent flowers. Next spring you can prune the shrub by removing additional branches to thin it out and cut the remaining branches to shorten the shrub, if desired. In total not more than 25% of the shrub should be pruned. The following spring (2015) more branches can be removed if necessary.