Prickly acacia is a thorny shrub or small tree growing from 4–5 m to occasionally 10 m tall. The plants are distinct with fern-like leaves, a pair of stout thorns (1–5 cm long) and pods.
Young shrubs form dense thorny thickets and mature plants are usually single stemmed with spreading branches that have lost their thorns. The bark on saplings has a tinge of orange and/or green. Older trees have dark, rough bark.
The ball-shaped flowers are golden-yellow and about 1 cm across. The flowers grow in a group of two to six on a stem. The flat pods are 10–15 cm in length and turn grey when ripe.
Controlling Prickly Acacia
Prickly Acacia is a weed of national significance and is identified as being invasive, having the potential for widespread environmental, social and economical damage. Landowner’s and land managers at all levels are responsible for actively managing this weed.
For best results use Starane Advanced for seedling and young plants up to 2 m tall at the rate of 450 mL/100 L of water. For best results add Uptake™ Spraying Oil.
Consult Tropical Weeds Research Centre, Charters Towers, for specific advice on application.
When treating with Access™ Herbicide as a basal bark application (plants with stems up to 5 cm basal diameter), use the 1 L/60 L of diesel rate.
Herbicides for Control of Prickly acacia
#Note: Preferred product option in bold. *Consult label for details of growth stage and use, especially where range of rates is given.