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.

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.

Garden Club located in Federal Way providing education, resources, and networking opportunities to promote the love of gardening.

The Northwestern Chapter of the North American Rock Garden Society (NWNARGS) is a society of plant enthusiasts located in the Seattle metro area.

Offers educational programs covering civic beautification, environment protection and conservation, and horticulture. Newsletters, event calendar, and club history.