Palm
Blue Hesper Palm
Brahea armata · Arecaceae
Also called: Mexican Blue Palm, Mexican Blue Fan Palm, Blue Fan Palm
Blue Hesper Palm (Brahea armata) is a very low-water palm well suited to Tucson and the low desert. It thrives in full sun.
Blue Hesper Palm at a glance
- Water use
- Very Low (established)
- Sun
- Full sun. The blue-silver waxy fronds are an adaptation to deflect intense desert sun; thrives in reflected heat.
- Mature size
- Typically 15-25 ft tall (eventually to ~40 ft) with a dense 6-10 ft wide crown; stout trunk
- Growth rate
- Slow (about 1 ft per year)
- Bloom
- Showy creamy-white to pale yellow flowers on very long arching stalks that extend well beyond the crown, Spring to early summer (the long flower plumes are an ornamental feature)
- Cold hardiness
- Very cold-hardy for a blue palm - tolerates brief drops to about 16-18 F. One of the most cold-tolerant ornamental palms for Tucson; mature plants rarely need frost protection. USDA 8b-11.
- Soil
- Needs excellent drainage. Thrives in Tucson's rocky, alkaline, well-drained soils; intolerant of soggy ground.
- Native range
- Baja California, Mexico (Sonoran/Baja desert region - regionally adapted but not native to Arizona)
- Best used as
- Premium low-water specimen palm, Xeriscape and desert/Mediterranean landscapes, Focal accent for its blue foliage and dramatic flower plumes
- Wildlife
- Flowers attract bees and pollinators; fruit eaten by birds and wildlife.
- Toxicity
- Not known to be toxic to people or pets.
How to grow Blue Hesper Palm in Tucson & the low desert
Watering
Very drought-tolerant once established. Deep soak every 2-3 weeks in summer keeps it attractive and growing; can survive on far less. Reduce to monthly or less in winter. Excellent dry-climate, low-water palm.
Fertilizer & nutrients
Light feeder. Apply a slow-release palm fertilizer with magnesium and micronutrients 1-2 times in the warm season. Low but consistent fertility keeps fronds blue and full; avoid overfeeding.
Pruning & care
Minimal. Remove only dead brown fronds and old fruit stalks. Retains a tidy crown naturally; over-pruning green fronds harms it.
Notes
Arguably the best blue fan palm for the Tucson low desert - exceptional heat and drought tolerance plus strong cold hardiness. Slow growth means buy a sizable specimen for impact. The silvery-blue color is most intense in full sun and lean conditions.
Sources: University of Arizona CALES LAR 520 plant database - Brahea armata; Green Things Nursery (Tucson) plant database - Brahea armata; Mountain States Wholesale Nursery - Brahea armata; Gardenia.net - Brahea armata