In addition to a focus on Northwest native plants, the Arboretum has one of the world's largest collections of the Western Azalea (Rhododendron occidentale), with over 200 selections of the species.
The arboretum was first established as a nonprofit organization in 1965, with its initial design completed and implemented in 1970.
The recently incorporated City of Maple Valley finalized the transfer of Lake Wilderness Park and the Arboretum from King County in January 2003.
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