Native & adapted

Willow acacia

Acacia salicina

Narrow, evergreen Australian shade tree; place away from paving and use as an adapted—not native—canopy.

Arid adaptedEvergreenFast growingLow water

Landscape layersUpper canopy

Mature size20–30 ft tall × 15–25 ft wide

Climate fitUrban core · USDA 9b–10a · Valley suburbs · USDA 9a–9b · Desert outskirts · USDA 8b–9b

Special categoriesARID ADAPTED

Hardiness guidanceUSDA zones 9–11; hard freezes can damage exposed growth

Right plant, right place

Will Willow acacia grow at your Arizona property?

Fast and mostly thornless, but not native. Keep it away from paving and sewer lines, expect litter and occasional root suckers, and train branch structure early.

Best regional fit: Urban core · USDA 9b–10a, Valley suburbs · USDA 9a–9b, Desert outskirts · USDA 8b–9b.

Light

Sun exposure

Full sun. Its narrow canopy suits warm side yards only when root and crown space are adequate.

Water

Irrigation

Low once established. Deep irrigation every 2–3 weeks in summer is generally sufficient.

Choose the actual plant, not only the label

Cultivars & selections

The species is usually sold without a cultivar. Confirm the botanical name because several unrelated narrow-leaved acacias are sold under similar common names.

Species form

Acacia salicina

Mature size20–30 ft tall × 15–25 ft wide

Best forNarrow evergreen screening and fast adapted shade

Often grows 2–3 ft per year with regular establishment water. Select an upright specimen with well-spaced branches and verify that it is not a similar acacia species.

Planting & stewardship

How to help Willow acacia thrive

1
Confirm the plant’s mature spread and underground conflicts before digging.
2
Place the root flare at finished grade and keep mulch away from the trunk.
3
Establish a wide, deep root zone instead of irrigating only at the trunk.
4
Observe seasonal growth, heat stress, and wildlife use before making major pruning changes.