History of the Arboretum

A celebrated Olmsted park and botanic garden

Washington Park Arboretum has a long and complex history. Prior to white colonial settlement, the land was home to Coast Salish people, who had several villages in the Union Bay area. Towards the end of the 19th-century, it was owned by the Puget Mill Company, which logged the land’s large trees in the 1880s. In 1900, the site became a city park, Washington Park (one of Seattle’s first), and was home to a speedway for horse racing and a sanitary fill.

In 1903, the Olmsted Brothers Landscape Architects firm created the design for Lake Washington Boulevard, which weaves through to present-day Arboretum, as part of its comprehensive plan for Seattle parks and parkways. Washington Park remained largely undeveloped in the 1910s and 1920s.

Strollers on Azalea Way, 1957. Photo by John Valentine, Courtesy MOHAI (1986.5.15741.1)

Interest in creating an Arboretum in Seattle had been brewing for three decades among staff at the University of Washington and members of the community. The Arboretum was officially established in 1934. The following year, the Arboretum Foundation was formed to raise funds for the nascent botanical garden. In 1936, thanks to a donation from the Seattle Garden Club, the Olmsted Brothers were hired to create a design plan.  

With the Great Depression in full swing, much of the early construction and planting work in the Arboretum was carried out through the Works Progress Administration. The speedway became Azalea Way, one of the central features of the Arboretum. In the decades to come, especially under the tenure of Brian Mulligan (director from 1945 to 1972), the Arboretum’s plant collections developed, flourished, and grew to what you see today.

Further Reading

  • HistoryLink, a free online encylopedia of Washington State history, also published an excellent short history of the Arboretum in January 2013.
  • Read a detailed historical review (PDF 12.0 MB), commissioned by the Arboretum and Botanical Garden Committee in 2003 and co-authored by BOLA Architecture & Planning and Karen Kiest Landscape Architects.
2022 Annual Meeting Report

2022 Annual Meeting Report

We had a good turnout for our Annual Meeting on June 15—our first in-person version of the event in three years! More than 70 Arboretum Foundation members joined us to hear about our fiscal-year accomplishments, listen to updates from our UW and City partners, and...

Snakebark Maples of the Arboretum

Snakebark Maples of the Arboretum

We admire the stripes of tigers, zebras, and exotic reptiles as marvels of natural pattern. The plant world has its fair share of stunning striation, too, perhaps no more astounding than in the snakebark maples (including the Japanese red snakebark maple, Acer...

Ginko Biloba

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