Status of prickly acacia in Tasmania(Acacia nilotica ssp. indica)
- Prickly acacia is a declared weed in Tasmania under the Tasmanian Weed Management Act 1999. The importation, sale and distribution of mimosa are prohibited in Tasmania.
- Prickly acacia is also a Weed of National Significance (WONS).
legal responsibilities of landholders and other stakeholders in dealing
with prickly acacia are laid out in the prickly acacia Statutory Weed
What does prickly acacia look like?
acacia is a small, thorny and spreading tree usually growing to 5
metres, but which can grow to 10 or more metres in optimal conditions.
The leaves are fern-like, around 30 to 40 mm long, and composed of 30 to
40 leaflets. A pair of stout spines, 10-50 mm long, grows at the base
of each group of leaves in young stems.
- Fluffy round clusters of
golden yellow flowers occur in groups of 2-6 at the leaf base, and the
seed pods are grey-green, covered in fine hairs and generally 100-200 mm
long. The characteristic constrictions between each seed in the seed
pod resembles a strand of pearls.
- Spread is via seed. Seed can
be spread in water. However most spread in Queensland has been by cattle
which eat the nutritious seed pods.
- See the WONS website for more information on identifying this weed.
Image above left: Prickly acacia, image: Paul Bolstad, University of Minnesota, Bugwood
Image above: Prickly acacia branch with flowers, image: Paul Bolstad, University of Minnesota, Bugwood
Impacts of prickly acacia
acacia is capable of infesting vast tracts of grasslands and woodlands.
The weed can severely reduce grassland productivity and restrict access
- Severe infestations can impact on native biodiversity.
Where does prickly acacia occur?
- Prickly acacia is native to Africa (Ethiopia and Somalia) through to Pakistan, India and Burma.
- On mainland Australia, prickly acacia occurs in Queensland.
- Prickly acacia does not occur in Tasmania.
What you need to do
- If you locate
prickly acacia anywhere in Tasmania, or if you find a plant that you
think could be prickly acacia, immediately contact your Regional Weed
Management Officer on 1300 368 550 to report this weed.
Weed Links and Resources
Other useful links
Weeds in Australia - Weed Management Guide
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