'Desert Museum' Palo Verde: A Thornless, Fast-Growing Tree with a Green Trunk and Golden Flowers

Few trees match the year-round charisma of 'Desert Museum' palo verde (Parkinsonia × 'Desert Museum', syn. Cercidium × 'Desert Museum'). Its photosynthetic green trunk and branches, airy canopy, and profuse yellow flowers from spring through fall make it a standout — and it's thornless, fast-growing, and drought-tolerant. A hybrid of three Arizona natives (Mexican, blue, and little leaf palo verde), it combines their best traits while shedding their drawbacks.

Quick Profile

• Botanical name: Parkinsonia × 'Desert Museum'
• Common name: 'Desert Museum' palo verde
• Origin: Hybrid of Arizona natives
• Hardiness: 15°F (zone 8)
• Water: Low
• Light: Full sun
• Size: 25 ft tall and wide
• Benefits: Drought-tolerant once established; thornless; long bloom season
• Bloom: Spring, sporadically through summer and fall
• Plant: Fall or spring

Distinguishing Traits

• Green trunk & branches: Photosynthesize even when leafless (drought-deciduous).
• Superior hybrid traits: Brighter green trunk, larger flowers, more upright habit than parents.
• Thornless: Safe for pedestrian areas; typically multi-trunked.
• Long bloom: Bright yellow flowers from mid-spring, intermittently into fall.
• Propagation: Cuttings only (hybrid doesn't come true from seed).

Landscape Uses

• Filtered shade: Airy canopy cools patios, paved areas, and understory plantings.
• Focal point: Striking alone or in a row.
• Companions: Gold and purple trailing lantana (Lantana montevidensis), autumn sage (Salvia greggii) thrive in its dappled shade.

Planting & Care

• Well-drained soil, full sun.
• Hole 3× root ball width; depth = root ball (no deeper).
• Buy smaller (15-gal); fast growth catches up to boxed trees quickly.
• Prune summer after flowering slows; maintain vase shape.
• Deep, periodic watering appreciated; avoid overwatering (causes limb breakage).