Rose of Sharon flowers wilt shortly after blooming, we have a lot of buds but all flower\'s wilt within a couple of day\'s. We had a very WET May and now temp\'s in the 90\'s. Last yr flowers were plentiful and had no problem. I cut back some this winter, leave\'s look ok had some Japanese Beatle start on leaves but sprayed with Permethrin and they are gone?
Rose of Sharon Problem
Certified GKH Gardening Expert
You could try a fertilizer high in phosphorus( the P in NPK). This article may help as hibiscus is the perennial version of Rose of Sharon