Experts and BHG readers answer.
Trees/shrubs for a barrier
For trees in the sunny part of the garden, try American arborvitae (Thuja occidentalis), American holly (Ilex opaca), Bristlecone pine (Pinus aristata) or Incense cedar (Calocedrus decurrens). In front, place Buxus sempervirens (common box), Euonymus fortunei (wintercreeper), and Ligustrum ovalifolium (California privet). You want a mix of evergreen and deciduous trees and shrubs for a variety of textures and colors. For shade, there is not much in the evergreen category that will grow there. You could try some of the suggestions above, but they will not
perform as well in shade. Try Amur maple (Acer tataricum), a deciduous tree that nonetheless makes a good windbreak.