- 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
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