Our Collections

BTA holds collections of plants from the deserts of the United States, Mexico, Australia, Madagascar, India, China, Japan, Israel, South America, the Middle East, Africa, the Mediterranean, and the Arabian Peninsula.

Among these are three Nationally Accredited Plant Collections*: eucalyptus trees, desert legumes, and southwest oaks. To become nationally accredited by the Plant Collections Network, Boyce Thompson Arboretum has to demonstrate “long-term institutional commitment to collect, document, grow, and maintain living plants of a defined plant collection and conserve its germplasm.”

Eucalyptus Collection

BTA’s Eucalyptus collection was accredited in 2018. At 93 taxa, it is one of the largest collections in the US and features many trees planted in the 1920s, including “Mr. Big,” a Champion Tree. Native to Australia and Tasmania, the genus has over seven hundred species of flowering trees and shrubs. Eucalyptus trees are the preferred habitat and forage for koalas.

Oak Collection

In 2012, BTA gained accreditation of its collection of oak trees (genus Quercus). With an estimated 500 naturally occurring taxa distributed throughout a broad variety of climate zones and habitats, the genus is virtually impossible to represent at any single garden. Today, 20 gardens with large oak collections participate in this multi-site collection. BTA’s collection includes oak trees sourced from Arizona, New Mexico, and west Texas in the US, and Sonora, Chihuahua, and Coahuila in Mexico.

Desert Legume Collection

BTA’s Desert Legume (or Fabaceae Collection) is the first primarily seed-based collection accredited (2014) by Plant Collections Network. The collection includes an internationally recognized seed bank of 1,454 taxa and 206 taxa grown in field plantings and the Taylor Family Desert Legume Garden at the Arboretum.

* The American Public Gardens Association Plant Collections Network coordinates a continent-wide approach to plant germplasm preservation, and promotes excellence in plant collections management. Plant Collections Network is a long-term collaboration between the American Public Gardens Association and the USDA–Agricultural Research Service. Gardens and arboreta must maintain collections according to professional standards; provide reasonable access to collections for research, evaluation, and introduction; and demonstrate the likelihood for long term stability and support for collection.

Collecting and directing stormwater is essential for a desert garden's survival. If left unmanaged, pooling rain can damage plants and nearby buildings. Thanks to the generous support of Water Wise Arboretum donors, we now have several stormwater features around the Smith Greenhouses! It helps protect our historic buildings and guides the water to plants that need it most.

You can spot one of these water capture systems in front of the Smith Greenhouses. Arizona poppies are currently blooming inside, a living proof of its success!

#WaterConservation #stormwaterdrain #waterflow #desertgarden #arizonapoppy

It's time for another bird walk! Join us Wednesday, September 2 from 6:15 - 7:45 am for a guided walk through the Arboretum with a birding expert. During last month's walk, we saw more than 30 unique bird species! You won't believe how much life can be found in the desert.

Our bird walks are free with admission! We hope to see you there.

#birdwalk #birding #AZBirding #birdlovers #naturelovers #birdphotography

BTA holds collections of plants from the deserts of the United States, Mexico, Australia, Madagascar, India, China, Japan, Israel, South America, the Middle East, Africa, the Mediterranean, and the Arabian Peninsula.

Eucalyptus Collection

Oak Collection

Desert Legume Collection

#1Arb