Boyce Thompson Arboretum
A desert botanical garden in Arizona with global arid-land plants
This 392-acre site in the Sonoran Desert showcases over 2,600 species of dry-climate plants from six continents. Founded in 1924 as a research facility and living museum, it features themed gardens, nature trails, and serves as both a state park and scientific institution.
- Holds over 2,600 arid-land plant species from six continents
- Designated an Important Bird Area by the Audubon Society
- Manages a seed bank backed up in Svalbard’s Global Seed Vault
- Accredited collections of desert legumes, oaks, and eucalyptus
- Founded in 1924 as both a research station and public garden
What is Boyce Thompson Arboretum?
Set along Queen Creek beneath Picketpost Mountain, this desert garden spans 392 acres. Visitors follow a main loop trail past cacti, palms, eucalyptus groves, and regional exhibits from Australia, South America, and the Chihuahuan Desert. Side paths explore native plant uses and high-elevation habitats. Greenhouses, a visitor center, picnic spots, and demonstration gardens are also on-site.
The history of Boyce Thompson Arboretum
William Boyce Thompson, a mining magnate, founded the arboretum in 1924 near his winter home west of Superior, Arizona. He envisioned a practical collection of desert plants that could benefit the Southwest. Early staff built homes, greenhouses, and a lake for irrigation. It opened to the public in 1929 and became Arizona’s first nonprofit research organization.
What there is to see
The site combines natural desert terrain with curated plantings. Themed collections, like desert legumes, oaks, aloes, and eucalyptus, are arranged by geographic origin. Field plantings display species from the American Southwest, Mexico, Australia, and beyond. A seed bank preserves rare desert legumes, while mature trees planted in the 1920s still stand in the eucalyptus grove.
When to go
Open year-round, the arboretum welcomes visitors for walking, birdwatching, and learning about desert plants. Its riparian corridor draws wildlife and over 270 bird species, earning it recognition as an Important Bird Area. Educational programs, volunteer activities, and research collaborations continue its founding mission of study and conservation.
Parts and collections
Three nationally accredited collections anchor the site: desert legumes (including a major seed bank), southwest oaks from the U.S. and Mexico, and one of America’s largest eucalyptus collections. Notable holdings include endangered Madagascan aloes, New World Ephedra species, and vulnerable Dudleya succulents from western North America.
Why Boyce Thompson Arboretum matters
Listed on the National Register of Historic Places since 1976, the arboretum operates under a unique partnership between a nonprofit board, the University of Arizona, and Arizona State Parks. Its journal *Desert Plants* began publication in 1979. Seeds from its Desert Legume Program are stored in Norway’s Global Seed Vault and a U.S. national repository.
Questions people ask about Boyce Thompson Arboretum
Where is the Boyce Thompson Arboretum located?
It lies in the Sonoran Desert of Pinal County, Arizona, along U.S. Highway 60, about three miles west of Superior and an hour east of Phoenix.
What kinds of plants grow there?
Over 2,600 species of arid-adapted plants from deserts worldwide, including cacti, agaves, aloes, boojum trees, legumes, oaks, and one of the largest red gum eucalyptus in the U.S.
Is it just a garden or does it do research?
It functions as both a public botanical garden and an active scientific institution, managing accredited plant collections and a seed bank focused on desert legumes.
Why is it significant for birds?
Its location along Queen Creek creates a riparian zone in the desert, attracting 270 bird species and earning it designation as an Important Bird Area.
Who founded it and why?
Mining entrepreneur William Boyce Thompson established it in 1924 to study useful desert plants and make arid lands more productive, calling it a 'living museum' with practical aims.
Good reading and sources
- Boyce Thompson Arboretum on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Boyce Thompson Arboretum", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). Phool rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes. Opening times, prices and bloom dates change: check with the place before you travel. If something is wrong, tell us. Last refreshed 2026-10-03.
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