I am sorry for this delayed reply to your gardening question. We are transitioning to a new Q&A system and your question was unfortunately lost in the transition. I have discovered it now and hope this reply is not too late to be of help.
There are very few shrubs that fit all the specifications you mentioned. I think a good choice might be Rose-of-Sharon also called Shrub Althea (Hibiscus syriacus). It gets fairly large but would be a pretty shrub in summer.
Thanks for the question. Please stop in again soon!
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