Answer: For trees that will reliably remain under 20' tall, I recommend semi-dwarf apple trees, or an ornamental crab or cherry. They'll provide shade and color, and fruit as well. If you want to try evergreens, check out the smaller junipers and white cedars in local nurseries. They come in many different growth habits, so ask plenty of questions about the mature shape and height you can expect. Best of luck!
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