The Washington Tilth Association (originally the Northwest Tilth Association) is an American nonprofit membership organization dedicated to supporting and advocating organic food and farming.
Chapters Pierce Tilth Association Seattle Tilth South Whidbey Tilth Sno-Valley Tilth Spokane Tilth Tilth on the Willapa Tilth Producers of Washington Vashon Island Growers Assn. (VIGA)
See also Oregon Tilth Agriculture in Washington
References (review)
Further reading
External links
Guide to the Tilth Association Papers 1974-1986 (Manuscripts, Archives, and Special Collections, Washington State University Libraries)