Answer: The first thing to consider is how close the tree will be to your house, since as a tree grows, roots can interfere with the house's foundation. If you can plant the tree at least several feet from your house, a small columnar juniper, or dwarf fruit tree may be nice. Much depends on what affect you are looking for - shade, color, bloom, fruit, etc. A local nursery can advise you on the best varieties of trees and shrubs for your climate.
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