Mimosa bush

Native to Central and South America, mimosa bush is a rounded shrub or small tree that can be confused with the declared weeds mesquite and prickly acacia. It forms thorny thickets that hinder mustering and stock access to water.

Mimosa bush is not a prohibited or restricted invasive plant under the Biosecurity Act 2014.

Scientific name

Acacia farnesiana, syn. Vachellia farnesiana

Similar species

Description

  • Rounded shrub or small tree 3-5m tall.
  • Branches are usually greyish-brown with prominent white spots, grow in a zigzag shape.
  • Leaves are pure green or sometimes yellowish green, ferny, with 1-6 pairs of leaf 'branches' each with 5-20 pairs of narrow, rounded leaflets 4-8mm long.
  • Thorns are paired at base of each leaf, up to 10cm long.
  • Flowers are ball-shaped, about 1cm wide, golden yellow to orange, grow on stalks.
  • Pods are dark brown or black, woody at maturity, with seeds embedded in pith.

Habitat

  • Prefers dry localities, and loamy or sandy soils.
  • Forms thickets along watercourses.
  • Withstands drought well, readily eaten by stock, has good regrowth after grazing.

Distribution in Queensland

  • Widespread in Queensland.

Life cycle

  • Flowers autumn to early summer.

Impacts

Economic

  • Forms thorny thickets that hinder mustering and stock access to water.

How it is spread

  • Spread by movement of seed.

Control

Herbicide control

Basal bark spray
  • For stems up to 15cm in diameter, carefully spray completely around base of plant to 30cm above ground level. Thoroughly spray into all crevices. Larger trees may be controlled by spraying to greater height, up to 100cm above ground level.
  • Best time for treatment is during autumn when plants are actively growing and soil moisture is good.
Cut stump treatment
  • At any time of year, cut stems off horizontally as close to ground as possible. Immediately (within 15 seconds) swab cut surface with herbicide mixture.
Bore drains
  • Seek technical advice on options for treating channels such as bore drains.

See the Mimosa bush fact sheet (PDF, 925KB) for herbicide control and application rates.

Biological control

  • Mimosa bush is not a target for biocontrol.

Legal requirements

  • Mimosa bush is not a prohibited or restricted invasive plant under the Biosecurity Act 2014. However, by law, everyone has a general biosecurity obligation (GBO) to take reasonable and practical steps to minimise the risks associated with invasive plants and animals under their control.
  • Local governments must have a biosecurity plan that covers invasive plants and animals in their area. This plan may include actions to be taken on certain species. Some of these actions may be required under local laws. Contact your local government for more information.
  • Not a declared species under Queensland legislation but may be declared under local government law.

More information

Contact us

Call your local government office, or Biosecurity Queensland on 13 25 23.

Last updated
01 July 2016

Contact

General enquiries 13 25 23

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