Answer: The area you describe probably won't provide enough room for healthy tree root growth, but you can plant some treelike shrubs in the area. Here are a few suggestions for polite, medium sized treelike plants:
Dracaena, Ensete (banana), tree ferns, small palms such as Sabal minor, Schefflera, Camellia, Fatsia japonica, and Viburnum. Both camellia and viburnum flower, but the petals tend to drop straight down when the flowers are spent and generally won't blow around in gentle winds.
Hope these plants appeal to you!
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