Blackbrush Acacia
Vachellia rigidula
A dense, thorny acacia with light yellow spring blooms, ideal as an impenetrable barrier that also supports pollinators.
Hardy to about 15°F in low and mid desert, with excellent heat and frost tolerance.
AMWUA Notes
Very low water; a dense thorny barrier plant that also feeds pollinators.
Care Guide
Deep-soak every 3-4 weeks in summer once established; needs minimal water when mature.
Wear gloves for the dense thorns; leave as a barrier or thin to a small tree in late winter.
No fertilizer needed; a nitrogen-fixing legume.
Essentially pest-free.
Light-yellow fragrant flower spikes in spring; semi-evergreen with low litter.
Soil, Feeding & Propagation
Sharply draining rocky, limestone, or decomposed-granite soil; thrives on lean caliche and alkaline pH 7.5–8.5
Needs sharp, fast-draining soil.
None — thrives in lean desert soil without fertilizer.
Grown from scarified seed; slow to establish into a dense thorny screen
12–15 ft
Deep, non-aggressive roots; the dense thorns make it a barrier plant, so keep off walkways and pools
Placement Tips
- •Dense and thorny to about 15 ft, ideal as an impenetrable security or barrier hedge.
- •Keep the thorns off walkways and pools.
- •Low litter and drought- and heat-proof; excellent on the toughest sites.
- •Full sun; can be shaped into a small multi-trunk tree.
Features
Best Uses
Ecological Value
Attracts
Companion Plants
Quick Stats
Design Styles
Include in Your Project
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Use this care guide to maintain your Blackbrush Acacia. Questions about your landscape? Reach out anytime.
Data from 2024 AMWUA “Landscape Plants for the Arizona Desert” guide.