Best Trees for Seattle
Part 1: Practical Tips from Landscape DesignersBy Janine Anderson, CPH
Professional Member, APLD
Why Do You Need a Tree?Trees provide countless benefits, not just for humans but also for the larger world—truly, we couldn’t live without them. Not only do trees add an aesthetically pleasing element to a landscape, thereby also increasing your property value, they also make us feel more peaceful—surgical patients have been shown to recover more quickly if they can see trees from their hospital rooms. And the scale of trees allows them to be enjoyed by you and your neighbors alike.
Trees serve practical functions such as providing shade on hot summer days, blocking winds, and screening unsightly views. They take up water in their roots, reducing the likelihood of flooding during heavy rains. Their network of roots can also help bind the soil, reducing the risk of landslides, and the decaying foliage from deciduous trees enriches the soil. In cities, trees moderate the heat island effect created by pavement and buildings, and they help improve air quality by absorbing air pollution into their leaves and giving off oxygen. Without trees, you probably won’t have many birds visiting your yard. Birds use trees for nesting, resting, feeding, and shelter.
Tree FearsMany homeowners become anxious on the subject of trees—will the tree get too big, will it block a view, will it be messy, and will the roots block the sewer line? All of these concerns have some validity, but selecting the right tree for the location and caring for it properly will minimize the likelihood of an undesirable outcome. The complaint about trees being messy, however, is somewhat difficult to address. All living trees grow and shed throughout the seasons. Deciduous trees lose their leaves; evergreens shed their older leaves or needles; pollen drifts and can blanket an area; and flower parts, cones, and fruit will all drop to the ground in due time. Their litter can be reduced by, for example, planting a tree that bears a pulpy fruit or is prone to aphids away from a walkway, activity area, lawn, or parked cars, but tree litter cannot be eliminated entirely. Appreciating this cycle might require a change in attitude away from the need for a pristine property and toward a reverence for what a tree contributes to your landscape and to the larger world.
What’s the Best Tree for You?The best tree for you depends on different criteria. Site conditions, such as soil type, sun and wind exposure, and soil hydrology, can all affect the decision as to what tree is best suited for your landscape. In addition, personal taste as to foliage color, blooms, and other aesthetic considerations will further narrow down your search for the perfect tree.
Trees to Beautify Your Landscape
Mary Randlett/Great Plant Picks
Form, color, and texture of Weeping Sequoia on left balances other plantings
Autumn fruit, flowers, and foliage of Strawberry Tree
Richie Steffen/Great Plant Picks
Fall foliage of Cutleaf Japanese Maple (Acer palmatum ‘Seiryu’)
Lynne Harrison/Great Plant Picks
Conifers also can be interesting year round, with their lovely needles, colorful cones, and unique forms. Blue Japanese White Pine (Pinus parviflora ‘Glauca’) has soft, gray-blue needles with white stripes and two types of cone--mauve-pink pollen cones and leathery looking seed cones. Among the many other conifers that are striking year-round are our native Mountain Hemlock, Contorted Japanese Larch, and Weeping Giant Sequoia.
And don’t overlook broadleaf evergreens, such as the Strawberry Tree (Arbutus unedo). This small tree has all of the attributes or our native Madrone (Arbutus menziesii) but none of its drawbacks. Its common name comes from the red, strawberry-sized berries that adorn the tree in the fall—at the same time its white, bell-shaped flowers appear. Arborizing a Strawberry Tree by removing its lower side branches enables you to better appreciate the exfoliating, reddish bark, which contrasts handsomely with its leathery, dark green leaves.
Trees as Focal Points
Many specimen trees can stand on their own as focal points in a garden, filling much the same role as a showcased sculpture. The endless varieties of Japanese Maple differ in size and the color and shape of their leaves, but their unique forms, flowers, samaras (the helicopter-like structures that hold the seeds), and fall display can stop viewers in their tracks. Acer palmatum ‘Seiryu’ has finely dissected bright green leaves that become orange-gold in autumn. It differs from most cut-leaf varieties in that it has an upright vase-like form at maturity. The gorgeous foliage of the Golden Full Moon Maple (Acer shirasawanum ‘Aureum’) is bright lemon yellow in spring, turning chartreuse in early summer. Nestled in the foliage are deep pink samaras. In autumn, the leaves exhibit tones of orange and red.
The Windmill Palm (Trachycarpus fortunei) is a perfectly hardy evergreen tree, but it catches our attention—and imagination—because it appears out of place in the Northwest, evoking where we might dream of being during the bleakest Northwest months, rather than where we are.
Trees for Shade
Richie Steffen/Great Plant Picks
Flowers of Yoshino Cherry
©www.wikipedia.org—Uberlemur at the English Wikipedia
Another good shade tree candidate is the fast-growing Green Mountain Sugar Maple (Acer saccharum ‘Green Mountain’), with its strong straight trunk, lovely uniform crown, and classic maple-like leaves that become rich orange and scarlet red in fall. And on sunny days in April, there’s nothing quite as wonderful as lying below the low, broad canopy of a Yoshino Cherry (Prunus x yedoensis), looking up through its cloud of white flowers. Among the more disease resistant of the flowering cherries, which as a group are not fond of our cool wet Northwest springs, the leaves of the Yoshino Cherry turn golden yellow with orange highlights in fall.