Answer: The fact that the leaves are not glossy rules out Chinese (tropical) hibiscus, so I'd guess your shrubs are Hibiscus syriacus, or Shrub Althaea. There are many named varieties; some are tall and some are short, and some begin with compact growing habits but spread open with age. These plants bloom on new wood, so attaching the stems to a fence might not provide a cascade of color. Instead, prune the plants back so the growth remains upright. In fact, you can prune these plants annually to keep them compact, cutting back the previous year's growth to only two buds. The flower colors and sizes vary but most have a contrasting eye and a red stamen. An absolute identification can be made by taking the flowers to a local horticulturist (at your Extension Service) or knowledgeable nursery person.
Q&A Library Searching Tips