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Description

The Australian willow quickly grows into a medium size evergreen tree with a rounded form, 20-35 ft. tall, 20-30 ft. wide. Foliage is comprised of narrow pale green leaves, 4-6 in. long, to 3/8 in. wide, that hang downward from branches to create a weeping character. Inconspicuous clusters of small creamy-white flowers occur in late fall to early winter.

Australian willow is native to warm and dry interior regions of Australia where annual rainfall varies between 6-15 in. and long periods of drought are common. It is a popular tree throughout the Inland Empire where it grows best in deep well-drained heavy to sandy loam soils. It is a good garden tree for its shade and graceful foliage character; it is also planted as a street tree.

Water Needs

The Australian willow is well adapted to our average winter rains for its moisture from November thorough March; afterwards, it performs best with periodic deep waterings during the warm and dry summer months. 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. It should be noted there are several months indicated by an asterisk (*) when winter rains can provide sufficient moisture and irrigation is not needed.

Irrigation Schedule and Graph

Moderate Water Use Plants

Irrigation Schedule 3

  Jan* Feb* Mar* Apr May Jun Jul Aug Sep Oct Nov* Dec*
Runs per Month 0x to 3x 0x to 3x 0x to 3x 2x to 3x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 1x to 2x 2x to 3x 0x to 3x 0x to 3x
Inches per Run 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1" 1"
 
Inches per Month 0" to 3" 0" to 3" 0" to 3" 2" to 3" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 1" to 2" 2" to 3" 0" to 3" 0" to 3"

Range of supplemental summer water: 9"-16"
Range of supplemental winter water: 0"-15"

 
0"-3"
0"-3"
0"-3"
2"-3"
1"-2"
1"-2"
1"-2"
1"-2"
1"-2"
2"-3"
0"-3"
0"-3"
  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, Low-branching
Growth Rate: Fast
Height: 20 ft. - 35 ft.
Width: 20 ft. - 30 ft.
Water Needs: Moderate 3
Foliage Color: Pale green
Flower Color: Insignificant, Cream
Flower Season: Winter, Fall
Soil Adaptations: Well-draining soil, Loam, Deep soil, Alkaline soil
Exposure Adaptations: Heat, Drought, Aridity, All day sun
Function: Foliage accent plant

Maintenance

Plan to prune when young for nice long-term structure, and a light annual pruning during the first five years of so. Best pruned in winter (D).

References