- Seattle DOT City Arborist
Links to permits and regulations.
- Plant Amnesty
Ending the senseless torture and mutilation of trees and shrubs.
- Seattle Heritage Tree Program
SHT recognizes landmark, historic or exceptional specimen trees in Seattle.
- Great Plant Picks
Trees, shrubs, and flowers recommended for the NW by the Elisabeth C. Miller Botanical Garden.
- Arthur Lee Jacobson
The local tree expert, author of several books on trees and plants, leads tours.
- WSU Gardening Extension
Info on master gardener program, clinics, and general gardening for Western Washington.
- Elisabeth C. Miller Horticulture Library
- International Society of Arboriculture