Desert fern tree, a small multi-trunk tree with a spreading canopy of feathery fern-like green leaves

Desert Fern Tree

Lysiloma watsonii
Categories:
Trees  ·  
Desert & Native Trees
Light
Full sun
Water
Low water once established. Water deeply and infrequently, allowing soil to dry between irrigations. In Phoenix, occasional deep summer watering helps maintain foliage; water young trees more regularly.
Size
15-25 ft tall × 15-20 ft wide
Habit
Upright tree – multi-trunk
Toxicity
Not Established
Description
A thornless Sonoran Desert tree with delicate, fernlike foliage and a spreading canopy that provides light, filtered shade.
Bloom Time
Spring to early summer
Deciduous / Evergreen
Semi-evergreen
Special Features
Drought Tolerant, Thornless, Thorny / Spiny
Growth Rate
Moderate to fast
Growth Habit
Upright tree – multi-trunk
Mature Size
15-25 ft tall × 15-20 ft wide
Flower Color
White
Foliage Color
Medium green
Landscape Use
Container / Patio, Desert / Xeriscape, Hedge / Screen, Native Garden
Garden Style
Arizona Native, Desert / Xeriscape, Hedge / Formal
Soil
Alkaline Tolerant, Sandy / Rocky, Well-Drained
Companion Plants
Brittlebush, Chuparosa, Desert marigold, Fairy duster, Parry's agave, Red yucca
Not Established
Not established — verify
Care Instructions

Light: Full sun; tolerates light shade.

Water: Low water once established. Water deeply and infrequently, allowing soil to dry between irrigations. In Phoenix, occasional deep summer watering helps maintain foliage; water young trees more regularly.

Soil: Well-drained sandy, gravelly, or loamy soil. Tolerates alkaline desert soils; avoid soggy sites and poorly drained caliche pockets.

Mature size: 15–25 feet tall and 20–25 feet wide, occasionally larger with favorable conditions.

Bloom: Late spring to early summer, typically May–June in Phoenix.

Evergreen / deciduous: Semi-evergreen; may shed leaves briefly in spring or during cold weather or prolonged drought.

Growth rate: Moderate to fast with supplemental irrigation; slower under dry conditions.