Double Pink Rose of SharonDouble Pink Rose of Sharon Lush Double Blooms When the Summer Garden Needs Them Most Most flowering shrubs peak in spring and early summer, then fade. The Double Pink Rose of Sharon (Hibiscus syriacus) does the opposite it waits until late summer, then opens wave after wave of full, double layered pink blooms that carry the garden all the way through fall. When everything else is winding down, this shrub is just hitting its stride. Why You'll Love It