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Tree Selection tree planting

Right tree, right place
When selecting a tree species, think about how large the tree will grow over its lifetime and if your yard has the right sunlight, space and soil conditions to thrive. In particular, consider:

  • Available space for tree branches and roots to grow. Trees should be planted 10 feet away from water, sewer and gas lines.
  • Tree size at maturity. The larger your tree is, the greater the benefits it can provide. However, before you plant a large tree you should be sure you have enough space for it. Trees planted under power lines should be less than 25’ tall at maturity.
  • Utilities. In addition to powerlines, trees should be planted at least 5 ft. from underground utility lines, 10 ft. from power poles, 20 ft. from street lights or other trees, and 30 ft. from a corner curb.
  • Evergreen or deciduous. Evergreen trees, which hold their leaves year-round, trap far more stormwater runoff than do deciduous trees, helping keep our waterways clean.
  • Summer growing conditions. Does your site need a tree that can handle drought or flooding?
  • Street tree permits. If your new tree will be in the planting strip or right of way, you need a permit from SDOT. You can obtain a permit by calling (206) 684-TREE or clicking here.

Consider Planting a Large Tree

Large trees often become treasured neighborhood assets.  Research has shown that they provide higher quality habitat for birds and other wildlife, and they have larger root systems to help stabilize hillsides and prevent erosion. Large trees do more to buffer weather conditions, providing shade on hot days to reduce the need for air conditioning, and blocking winter winds to help save on heating bills.

Large evergreen trees, especially conifers, are even better. Because large conifers grow so tall in our region, they produce a larger volume of leaf area on a smaller footprint – using the same amount of yard space but working harder to take in carbon dioxide, produce oxygen, and filter out air pollutants. And because evergreens hold their needles and leaves through the winter, our rainy season, they reduce stormwater runoff to a much greater extent than do small deciduous trees.

Further Resources

Demystifying the Art of Tree Selection

Street Tree Planting List

Seattle Master Tree List

King County Native Plant Guide

Great Plant Picks

Conifer database

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