Umbrella Thorn Acacia
Vachellia tortilis (formerly Acacia tortilis) · Deciduous Broadleaf, Hardwood
Plant Family
Fabaceae (Legume family)
Tree Category
Savanna Tree, Xerophyte, Shade Tree
Variety / Cultivar
Subspecies tortilis (typical form)
Hardiness Zones
USDA Zones 9–11; intolerant of frost and cold temperatures below -2°C (28°F).
About This Tree
An iconic savanna tree known for its distinctive flat-topped, umbrella-shaped canopy. It features a medium to spreading form with twisted branches and double-thorn sets (straight and hooked). It produces small, creamy-white spherical flower puffs and spiral-shaped seed pods.
Leaf Characteristics
Bipinnately compound leaves, very small and delicate (approx. 2.5 cm long). They are grayish-green, arranged alternately, and designed to minimize water loss in arid climates.
Bark Characteristics
Rough, fissured, and longitudinally furrowed bark. Usually dark brown to gray-black in color; older trees exhibit thick, protective textures to resist heat and pests.
Growing Information
Origin Region
Native to Africa (Savannas and Sahel), the Arabian Peninsula, and parts of the Middle East.
Growing Season
Leafing and flowering occur during the rainy season; it enters dormancy and often loses leaves during the dry season. Peak growth is typically in mid-summer.
Sunlight & Water Needs
Full Sun; low watering needs once established. Highly drought-tolerant with a deep taproot system designed to reach underground water tables.
Mature Size
Height typically 5 to 20 meters (16–65 ft); spread can be wider than the height, creating a broad shade canopy. Slow to moderate growth rate.
Special Characteristics
Highly drought and heat resistant; nitrogen-fixing capabilities enrich the soil. Known for spiral-shaped 'tortilis' seed pods and extreme salt tolerance in some subspecies.
Wildlife & Ecology
Critical ecological role: provides shade for savanna mammals. Leaves and pods are a primary food source for giraffes, elephants, and goats. Supports pollinators and provides nesting sites for weaver birds.