Native trees grow naturally in the forests of Northwest Washington. Most notable are the tall Douglas firs (Pseudotsuga menziesii), Sitka spruce (Picea sitchensis), western red cedar (Thuja plicata) and shore pines (Pinus contorta).
Common deciduous trees are the vine maple (Acer circinatum), red alder (Alnus rubra) and Pacific dogwood (Cornus nuttali). With sufficient room, any of these trees would be a fine choice.
There are trees that may not be native but still thrive in Washington. There are hundreds of cultivars of Japanese maple (Acer palmatum) that do well. Kousa dogwoods (Cornus kousa) and star magnolias (Magnolia stellata) are stunning and come in both pink and white. Shade trees include many varieties of oak (Quercus sp.), hornbeam (Carpinus sp.) and tulip trees (Liriodendron).
There aren't many broadleaf evergreen trees suitable for Washington, but people have grown southern magnolia (Magnolia grandiflora) successfully. Pacific madrone (Arbutus menziesii) is a native tree but difficult to transplant, therefore it's difficult to buy one at a nursery.
Some shrubs grow large enough to be called trees. "Loder's White", "King George", "Pink Diamonds" and "Venus" are all rhododendron varieties that grow very tall. Most camellias can grow very large.
Washington is filled with conifers, and many will do very well there. Most firs (Abies) do well, and can be found in a wide range of sizes and shapes. Cypress (Chamaecyparis) can be tough as well as structurally interesting. Spruce (Picea) is a staple in the Northwest; the most popular spruce is the Colorado blue spruce (Picea pungens glauca).
Most varieties of yews (Taxus), cedars (Thuja), and hemlocks (Tsuga) thrive in Northwest Washington.