Answer: You might find that one of the hardy hibiscus shrubs, Hibiscus syriacus, would do the job. These bloom in summer after the redbuds, are available in whites and pinks and purples, and can be pruned annually in late winter or early spring to a fairly tight columnar form. (Their natural shape is upright to about 12 feet with a width is not all that wide if you would prefer to avoid an extensive annual pruning job.) Another option would be to install a tall trellis sized to fit and grow a flowering vine on it, vines to consider would include clematis and the many attractive annual vines such as morning glories. The trellis would provide winter interest, structure and height while the vine could provide color of your choice. I hope this gives you some ideas.
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