Blue Palo Verde
Arizona’s state tree sheds tiny leaves during drought, photosynthesizes through blue-green bark, and erupts in pollinator-rich yellow spring bloom.
Artwork inspired by Dyana Hesson
Blue Palo Verde photosynthesizes through smooth blue-green bark after dropping tiny leaves during drought. In spring its crown can become nearly solid yellow, feeding pollinators and shading young saguaros.
Search broad desert washes rather than dry uplands. Compare the bluish bark and larger form with the yellower foothill palo verde on rocky slopes. Do not cut branches or park in washes to reach blooms. Flash floods can arrive from storms beyond the visible sky.
- Primary state
- Arizona
- Status
- Arizona state tree; foundational Sonoran Desert nurse tree
- Range
- United States and Mexico
Quick guide
- First decision
- Blue-green bark
- Context check
- airy crown; context: Desert washes, floodplains, and bajadas in the Sonoran Desert
Field decisions for Blue Palo Verde
- Establish the whole form
- Begin with Blue-green bark.
- Separate the nearest alternative
- Confirm airy crown before settling on the identification.
- Add ecological context
- Desert washes, floodplains, and bajadas in the Sonoran Desert; spring bloom; green bark all year.
- Leave the evidence intact
- Do not reposition, collect, bait, pursue, or clear vegetation around Blue Palo Verde.
Good to know
The strongest Blue Palo Verde record preserves the distinction between “Blue-green bark” and “airy crown” while also showing the surrounding habitat.
Notice these
- Blue-green bark
- airy crown
- and masses of yellow flowers