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Native Plant Society of Texas

Blackbrush Acacia

Vachellia rigidula

Other common name(s):

Blackbrush, Chaparro Prieto, Gavia

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.

Gulf Coast Prairies and Marshes, Southern Texas Plains
Laguna Madre Barrier Island and Coastal Marshes, Southern Subhumid Gulf Coastal Prairies
Northern Nueces Alluvial Plains, Rio Grande Floodplain and Terraces, Semiarid Edwards Bajada, Texas-Tamaulipan Thornscrub

Plant Characteristics

Growth Form

Tree

Height

6
to
19
ft.

Spread

2
to
4
ft.

Leaf Retention

Deciduous

Lifespan

Perennial

Habitat and Care Requirements

Soil Type(s)

Clay, Dry, Limestone, Loam, Sand

Light Requirement

Part Shade

Water Requirement

Medium

Native Habitat

Grassland, Savanna, Shrubland

Bloom and Attraction

Bloom Color

White, Yellow

Bloom Season

Spring

Seasonal Interest

Forage, Nectar, Pollen, Seeds

Wildlife Benefit

Bees, Birds, Butterflies, Deer, Moths

Maintenance

Drought tolerant needing very little supplemental water. Slow-growing but vigorous, blackbrush acacia suckers readily. Give lots of room or the suckers can be removed at ground level. Pruning encourages dense branching and more flowers. This plant has been used both as an ornamental and for erosion control. Plant away from high traffic areas due to spiny stems. Works well in rock gardens or xeriscapes or as hedges and screens. Native habitat: prairie, plains, meadows, pastures, savannas, chaparral and brush country, roadsides, limestone hills and canyons.

Description

Blooms March-June. Can grow as a small tree or tall shrub. It has numerous, straight, thorny branches with light gray bark. The small compound leaves are glossy and dark green. Produces tiny fragrant flowers clustered on 2-inch spikes. The fruit is a brown legume pod.
Previous Scientific Name(s): Acacia amentacea, Acacia rigidula

References

Learn about how to propagate Texas native plants.

Material Treatment Method Collection References
Seed Scarification Soaking seeds in concentrated sulfuric acid for 30 minutes has shown to enhance germination. It is important to keep the soil or cutting environment moist but not waterlogged. It can take several weeks for new roots to form, so be patient and continue to care for the plant during this time. Once the plant has established roots, it can be potted up into a larger container or planted in the garden. Collect seeds in late summer to early fall when seeds are firm, filled out, and dark brown 1) https://www.wildflower.org/plants/result.php?id_plant=VARI 2) https://plantiary.com/plant/vachellia-rigidula_51059.html
Stem Cutting Dip the cut end in a rooting hormone and plant it in a well-draining soil mix. Keep the soil moist and provide indirect light for the cutting to root successfully. It is important to keep the soil or cutting environment moist but not waterlogged. Covering with plastic bag can help maintain humidity. It can take several weeks for new roots to form, so be patient and continue to care for the plant during this time. Once the plant has established roots, it can be potted up into a larger container or planted in the garden. Select a healthy stem with at least two nodes and remove any leaves from the lower part of the cutting. 1) https://plantiary.com/plant/vachellia-rigidula_51059.html 2) https://plantiary.com/plant/vachellia-rigidula_51059.html 3) https://www.picturethisai.com/care/Vachellia_rigidula.html

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