The Inland Empire Gardeners Club
- Fun-loving gardening group in Spokane presents its annual expo and tour events, calendar, garden tips and garden of the month, and other gardening tidbits.
- http://www.tiegardeners.org

The Tacoma Garden Club
- Introduces itself and the area, and provides information about the native plant garden it maintains.
- http://tacomagardenclub.org/

Seattle Garden Club
- Offers educational programs covering civic beautification, environment protection and conservation, and horticulture. Newsletters, event calendar, and club history.
- http://www.seattlegardenclub.org/

Arboretum Foundation
- Seattle membership and volunteer organization, raises funds to support the Washington Park Arboretum collections, maintenance and education programs, and produces ongoing and seasonal plants sales. Events calendar, volunteer opportunities and news.
- http://www.arboretumfoundation.org/