Gardening
in Tucson, Phoenix,
Arizona and California

Gardening in Tucson, Phoenix, Arizona and California

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Acacia angustissima: Prairie Acacia

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Description
Form: A thicket-forming small shrub.
Leaf retention: Dies to ground in winter freezes.
Growth rate: Rapid.
Mature Size: Usually 1-3' high and wide, but can obtain 6'.
Flowers: White puff-ball flowers, 0.5" wide.
Bloom: Spring to end of summer.
Fruit: Brown seed pods to 3" long.
Leaves: Abundant, dark-green, tiny leaves give fern-like appearance. Leaves fold up when touched and at night.
Stems: Herbaceous stems on woody base. No thorns.
Roots: Nitrogen-fixing*, deep taproot, spreads by rhizomes.
Wildlife: Attracts butterflies, bees and birds. Browsed by large mammals. Caterpillar food plant for Acacia Skipper and Mexican Yellow butterflies. Seeds attract quail and other ground-feeding birds.
Toxic / Danger: To humans and pets, no. Some toxicity to sheep and other animals when fed at high concentrations.
Origin: North America.

Cultivation and Uses
USDA hardiness zones: 6-10.
Heat tolerant: Yes.
Drought tolerant: Yes.
Sun: Full sun to part shade.
Water once established: Monthly.
Soil: Adaptable, pH 5.6-8.5 (acidic to alkaline). *Do not use a nitrogen fertilizer.
Litter: Dies to ground in winter.
Propagation: Seed.
Uses: Soil-binding and erosion control, revegetation, butterfly garden.

Comments
Usually forms a thicket and can cover a large area. Control by growing inside a barrier or container.



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Acacia angustissima: Prairie Acacia - flowers

Acacia angustissima: Prairie Acacia - thicket