I would consider a semi dwarf crape myrtle, one that is listed as reaching 7 feet or so. It will not reach that size in a container. Another choice would be a Ficus tree if the area gets a little shade. You just would have to bring that indoors for winter.
Choose a quality potting soil and as large a container as you can. The more root zone the better. Fertilize with a soluble plant food such as Miracle Gro every 2 - 4 weeks at the label rate. Keep the soil moist but not soggy and make sure the container drains well.
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