Vachellia constricta

Common Names

Whitethorn Acacia, White Thorn Acacia, White-Thorn Acacia, Mescat Acacia, All-Thorn Acacia, Twinthorn Acacia, Huizache, Chaparro Prieto, Vara Prieta, Giidag

Summary

Whitethorn acacia is a drought-, cold-, and heat-tolerant native shrub to small tree of the southwestern United States and northern Mexico. It forms a dense, multi-stemmed shrub or small tree up to about 15 feet tall with paired white spines at leaf bases and even-pinnate leaves bearing small leaflets; flowers are fragrant bright yellow in dense globose heads at leaf axils in spring to early summer, followed by slender reddish-brown pods that are constricted between seeds, and extrafloral nectaries along leaf rachises attract ants. It is long-lived and supports bees, butterflies, and other insects.

In cultivation, it prefers full sun, well-drained soil, and is drought-tolerant with low maintenance, making it suitable for barrier hedges or erosion control in landscapes; hardy to USDA zones 7–11; propagation by seed (scarify, pre-soak) or by semi-ripe cuttings. This plant provides habitat for pollinators and wildlife, and seeds are used to make pinole in ethnobotanical contexts.

Lifecycle

Perennial

Height

12-20 ft

Spread

12-16 feet

Hardiness Zones

Zones 5-11

Sunlight Requirements

Ideally full sun.

Soil Type

Well-drained sandy to loamy soils, often with an impervious caliche or lime layer, pH 6.6–8.5.

Soil Drainage

Well-drained soil

Soil pH

7.0–8.5, Neutral to alkaline

Bloom Color

Yellow

Bloom Time

Spring

Foliage Color

Green

Fall Foliage Color

Green

Leaf Lifecycle

Deciduous

Growth Rate

Slow

Seasons of Interest

Spring, Summer, Fall (Winter in some cases)

Propagation Methods

Seeds, Cuttings, Division, root-crown sprouting

Attracts Wildlife

Bees, hummingbirds, butterflies, other pollinators, birds