Tree Care in Washington
TreeCareAdvisors covers 244 communities across Washington with localized tree care data, species guides, pest alerts, and cost estimates.
Common Trees in Washington
Douglas Fir
The defining tree of the PNW - can reach 250ft, dominant timber species
Western Red Cedar
Long-lived evergreen, naturally rot-resistant wood, cultural significance
Bigleaf Maple
Massive spreading maple, moss-draped in wet climates, golden fall color
Pacific Madrone
Beautiful peeling red bark, evergreen broadleaf, difficult to transplant
Sitka Spruce
Coastal giant, salt-tolerant, important wildlife habitat
Western Hemlock
State tree of WA - graceful drooping tips, shade-tolerant
Active Tree Threats in Washington
Laminated Root Rot high
Affects: Douglas fir (primary), grand fir, mountain hemlock - the dominant conifers of the PNW
Soil fungus (Phellinus sulphurascens) that spreads through root contact. Infected trees show reduced growth, thinning crown, and eventually blow over in wind because roots are rotted. Spreads slowly b...
Swiss Needle Cast moderate-high
Affects: Douglas fir - the most common tree in PNW landscapes
Fungal disease that causes Douglas fir to shed needles prematurely. Trees look thin and yellow. Fog and moisture promote the fungus. Coastal areas worst affected.
Bronze Birch Borer moderate
Affects: European white birch (highly susceptible), paper birch, other birch species
Native beetle that attacks stressed birch trees. Larvae bore under bark, killing branches from top down. European white birch (the popular ornamental) is far more susceptible than native species.
When to Prune in Washington
October through March during dormancy. Conifers: year-round for deadwood removal
Tree Service Tools
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Species Guides
Care guides for 134 tree species with photos and maps.