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Native Plant Society of Texas

White Thorn Acacia

Vachellia constricta

Other common name(s):

Whitethorn Acacia, White-thorn Acacia, Mescat Acacia, Mescat Wattle, Whitethorn, Vara Prieta, Chaparro Prieto

Family:

Fabaceae (Pea Family)

Plant Ecoregion Distribution Map

This map uses data from the US EPA. EPA  servers have been offline frequently so maps may not display. We are working on a solution.

Chihuahuan Deserts
Chihuahuan Basins and Playas, Chihuahuan Desert Grasslands, Chihuahuan Montane Woodlands, Low Mountains and Bajadas, Stockton Plateau

Plant Characteristics

Growth Form

Shrub

Height

7
to
10
ft.

Spread

4
to
5
ft.

Leaf Retention

Evergreen

Lifespan

Perennial

Habitat and Care Requirements

Soil Type(s)

Caliche, Dry, Limestone, Loam, Sand, Well Drained

Light Requirement

Sun

Water Requirement

Low

Native Habitat

Grassland

Bloom and Attraction

Bloom Color

White, Yellow

Bloom Season

Spring, Summer

Seasonal Interest

Forage, Nectar, Pollen, Seeds

Wildlife Benefit

Bees, Birds, Browsers, Butterflies, Nectar Insects

Maintenance

Drought tolerant and low maintenance. It is well-suited for xeriscapes and can be an attractive addition to any water-wise landscape. Ensure that the location provides ample space for it to reach its full size without overcrowding other plants. Native habitat: along washes, on slopes and mesas from 2,000-6,500 ft.

Description

Blooms May-August. A tall bush to small multitrunked tree. Produces small, yellow-orange balls of fragrant flowers. Compound leaves are finely segmented and fall off during dry seasons. Forms distinctive white thorns on older growth. The fruit is a bean-like pod that ripens to bright red.
Previous Scientific Name(s): Acacia constricta, Acacia constricta var. constricta, Acacia constricta var. paucispina

References

Learn about how to propagate Texas native plants.

Material Treatment Method Collection References
Seed Scarification Place pods in large plastic tub and stomp on them to break them open allow the seeds to fall out. Sieve the seeds from the pod material. It is necessary to scarify the hard coating on these seeds to improve germination rates. Scarification can be done by applying boiling water to the seeds and letting them soak for 3-24 hours. Mechanical scarification by sandpaper or nicking followed by hot water is also recommended. Collect seed late summer to early fall when seeds are firm, filled out, and dark brown. Be sure to wear gloves and avoid the thorns. 1) https://npn.rngr.net/renderNPNProtocolDetails?selectedProtocolIds=vachellia-constricta-vachellia 2) https://www.wildflower.org/plants/result.php?id_plant=VACO9
Clump Division Propagation is achieved through division, involving sharp, clean cuts to the root ball. Healthy sections should have robust roots and be replanted promptly in moist, warm soil to ensure successful establishment. https://www.picturethisai.com/wiki/Vachellia_constricta.html#:~:text=Water:%20Adapted%20to%20arid%20environments,soil%20to%20ensure%20successful%20establishment.
Semi-harwood Cutting Trim the cut end of each branch cutting just below a leaf node, and remove leaves from the lower half of the cutting to expose the nodes. Dip the cut end in a rooting hormone powder to enhance root development. Fill a pot with a well-draining soil mix, such as a blend of peat, perlite, and coarse sand. Make holes in the soil using a pencil or similar tool, then insert the treated cuttings into the holes without rubbing off the rooting hormone. Lightly press the soil around the cuttings for stability. Cover the pot with a clear plastic bag or place it in a mini greenhouse to maintain high humidity. Ensure the environment is well-ventilated to prevent mold growth, and avoid direct sunlight which can lead to overheating. Water the soil lightly to keep it moist but not waterlogged. Success can be expected in several weeks. Monitor the cuttings for root development and growth, transferring them to larger pots or to a garden setting once the roots are well established. Select healthy, non-flowering branches from a mature plant to use as cuttings. Ideally, choose semi-hardwood sections that are about 4 to 6 inches long and contain several leaf nodes. https://www.picturethisai.com/care/propagate/Vachellia_constricta.html#:~:text=Fill%20a%20pot%20with%20a,around%20the%20cuttings%20for%20stability.

About the Region

2026 Fall Symposium Logo

This low-elevations region of Texas extends inland from the barrier islands, about 60 or so miles, and stretches from Brownsville to Louisiana. In total, it covers about 9.5 million acres, with a high point of 150 feet in elevation. More than 1000 species of plants can be found in this region. On the southern end, species more common in Mexico (such as Sabal mexicana) and Central America occur.

The barrier islands provide us with dune systems, and clay flats to the inland side, which have species found in these areas alone. Many plants here, such as Ipomoea pes-caprae (beach morning glory), can be found throughout tropical regions of the globe. I’ve encountered the same species on the beaches of Guam.

Once inland, vast marshes and wet prairies occur. Occasionally, oak (Quercus fusiformis) groves can be found. Common grasses include species of Bothriochloa, Paspalum, and Sporobolus; eastern gamagrass (Tripsacum dactyloides); and switchgrass (Panicum species). Many rivers and creeks cut through the Gulf Prairies, and along these riparian areas various species of trees, Sabal minor, and other plants adapted to clay soils can be found. Due to overgrazing, farming, and fire suppression, woody species such as mesquite (Prosopis glandulosa) and huisache (Acacia farnesiana), and invasive species such as chinaberry (Melia azedarach), Brazilian pepper (Schinus terebinthifolius), and Chinese tallow (Sapium sebiferum) have increased and displaced our native flora.

Source: Wildflowers of Texas by Michael Eason