Palo Blanco
Mariosousa willardiana
A sculptural tree with striking white peeling bark that creates an elegant, luminous presence in the desert landscape.
Frost-sensitive, hardy to about 20-25°F and best in low desert; protect through the first winters.
AMWUA Notes
Very low water use; prized for its luminous white bark, and it resents overwatering.
Care Guide
Deep-soak every 2-3 weeks in summer once established; extremely drought tolerant with deep infrequent watering.
Prune minimally to showcase the trunk; remove lower branches to reveal the white bark and thin the airy canopy in late winter.
No fertilizer needed; a nitrogen-fixing legume.
Essentially pest-free.
Cream catkin flowers in spring; drought-deciduous with fine foliage and shedding white bark.
Soil, Feeding & Propagation
Sharply draining sandy, gravelly, or decomposed-granite soil; tolerates caliche and alkaline pH 7.5–8.5, and resents wet feet
Needs sharp, fast-draining soil.
None — thrives in lean desert soil without fertilizer.
Grown from scarified seed; frost-tender when young
8–10 ft
Slender, non-invasive roots; safe near pools and patios with only light litter
Placement Tips
- •Slender at about 10 ft wide, so it fits tight beds, entries, and courtyards.
- •Showcase the peeling white trunk against a dark wall or with uplighting.
- •Thornless and pool friendly; the fine airy foliage drops light litter.
- •Full sun; group two or three for a grove effect where space allows.
Features
Best Uses
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Palo Blanco. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.
Palo Blanco — common questions
Answers for low-desert Phoenix conditions, drawn from this plant’s growing data.
How much water does Palo Blanco need in Phoenix?
Palo Blanco is a very low-water tree once established. Deep-soak every 2-3 weeks in summer once established; extremely drought tolerant with deep infrequent watering. Very low water use; prized for its luminous white bark, and it resents overwatering.
How big does Palo Blanco get?
Expect roughly 20 ft tall and 10 ft wide at maturity, with a moderate growth rate. Allow about 8–10 ft of spacing when planting. Slender, non-invasive roots; safe near pools and patios with only light litter.
Can you plant Palo Blanco near a pool?
Yes. Palo Blanco is considered pool-friendly, meaning it stays clean enough around water features and hardscape. Litter is rated moderate.
Can Palo Blanco handle Arizona heat and winter frost?
Palo Blanco is hardy in USDA 9-11 and wants full sun. Frost-sensitive, hardy to about 20-25°F and best in low desert; protect through the first winters. Cream catkin flowers in spring; drought-deciduous with fine foliage and shedding white bark.
Does Palo Blanco have thorns?
No. Palo Blanco is thornless, so it is safe alongside walkways, patios and play areas.
Is Palo Blanco safe around pets?
Palo Blanco is listed as pet-friendly in this guide. If your dog is a determined chewer, check any new plant with your vet before planting.
When does Palo Blanco bloom in Arizona?
Palo Blanco blooms in spring, with cream flowers.
How much maintenance does Palo Blanco need?
Palo Blanco is moderate-maintenance. Leaf, flower and pod litter is rated moderate. Prune minimally to showcase the trunk; remove lower branches to reveal the white bark and thin the airy canopy in late winter.
What kind of soil does Palo Blanco need?
Sharply draining sandy, gravelly, or decomposed-granite soil; tolerates caliche and alkaline pH 7.5–8.5, and resents wet feet. It needs no supplemental feeding. No fertilizer needed; a nitrogen-fixing legume.
Is Palo Blanco native to Arizona?
No. Palo Blanco is not an Arizona native; it originates from the Sonora, Mexico, but it is grown successfully in low-desert landscapes here.