Pruning Potentilla and Rose of Sharon - Knowledgebase Question

Princeton, NJ
Avatar for FGUW09A
Question by FGUW09A
September 18, 1998
I have a ratty looking potentilla fruticosa (Abbotswood) and a way overgrown hibiscus syriacus. What's the best time to prune these plants? (I thought it was after blooming, which would be now, but I'm afraid to stimulate new growth just to have it killed by a frost.)

Answer from NGA
September 18, 1998
The "prune right after blooming" rule of thumb generally applies to spring blooming shrubs such as forsythia -- so you are quite right to wonder about these two.

The best strategy for potentilla is to prune it back quite hard in late winter, then tidy it again several times during the season if needed. Assuming it has enough water and nutrients, it will continue to bloom for most of the summer.

Rose of Sharon blooms in late summer on the current year's growth, so it is best pruned once in late winter or very early spring. At that time, you may prune it back as hard as needed to bring the size under control.

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