On April 9, 1954 the Palo Verde was declared Arizona's official state tree.

Palo Verde is Spanish for "green stick." There are two native Palo Verde tree types in Arizona. The Foothill Palo Verde has yellow-green branches and leaves, and the Blue Palo Verde has blue-green branches and leaves. Both types of Palo Verdes bloom in the spring with bright yellow flowers that attract many native desert pollinators. Some Palo Verde trees can live for more than a hundred years.