I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
A Knock Out rose would be fine if the pot is very large, say at least a half whiskey barrel sized pot. Another option is an Yellow Bells (Tecoma stans). I would not put any vines in the pot with these plants.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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