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Description

Mulga grows into a medium size evergreen tree, 15-20 ft. high and as wide with an upright branching structure and open foliage habit comprised of narrow silvery-gray phyllodes. Bright yellow flowers are modestly attractive from mid to late summer. Since this species is grown in nurseries from seed, there is often a range of variation in growth habit, foliage and flowering character of individual trees.

Mulga is the most widespread species of acacia in Australia. It grows in interior regions where annual rainfall varies from 4-20 in. and within warm and dry climate zones. Throughout its native range, soils are mostly acidic sands or sandy loams. These soils are often very low in available nitrogen and phosphorus. In the Inland Empire it is well adapted to heat, sun, aridity and extended periods of summer drought, and tolerates cold temperatures to 20°F.

This Australian species has become widely used in recent years as a landscape plant in desert-style gardens where it is considered to be a low maintenance and trouble-free tree. It grows well with average winter rainfall and performs well with low amounts of irrigation during the summer while maintaining good foliage character.

Water Needs

Acacia aneura is well adapted to the climate conditions occurring throughout the Inland Empire and can grow successfully with low amounts of supplemental water once established. The chart shown below provides a baseline guide to the monthly irrigation schedule and volume of supplemental water needed to maintain healthy growth throughout the average year. As shown in the chart below, there are several months indicated by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed.

Irrigation Schedule and Graph

Low Water Use Plants

Irrigation Schedule 2

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 2x 0x to 2x 0x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 0x to 2x 0x to 2x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
 
Inches per Month 0" to 2" 0" to 2" 0" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 0" to 2" 0" to 2"

Range of supplemental summer water: 7"-14"
Range of supplemental winter water: 0"-10"

 
0"-2"
0"-2"
0"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
0"-2"
0"-2"
  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
For more information on how to use this Irrigation Schedule and Graph, follow this link.

For information how to calculate your irrigation system’s schedule and precipitation rate, please follow this link.

Plant Properties

Plant Type: Tree
Foliage Character: Evergreen
Habit: Upright, Open
Growth Rate: Moderate, Long-lived
Height: 15 ft. - 20 ft.
Width: 15 ft. - 20 ft.
Water Needs: Low 2
Foliage Color: Gray green
Flower Color: Yellow
Flower Season: Summer
Soil Adaptations: Sand, Loam
Exposure Adaptations: Heat, Drought, Aridity, All day sun
Function: Residential spaces, Parkway and median tree, Flowering accent plant, Commercial spaces, Courtyard and patio tree

Maintenance

Prune when young to establish a nice long-term structure. This acacia is adapted to lean soils, so it is best to avoid long-term heavy organic (wood chip) mulching. Gravel or small stone mulch or shallow organic mulch, held away from the trunk and root crown, is okay Plant fall through early spring. Prune late winter (just prior to spring growth) or spring (D).

References

Associations

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