Prosopis glandulosa, P. pallida and P. velutina
This is a perennial tree which grows up to 15 metres high. It is thorny and usually has
a single main stem and spreading canopy.
Leaves are fern-like and are dark green, but can vary to bluish-green. Each leaf has
up to 4 pairs of leaf branches, with 6 to 18 pairs of leaflets on each branch. Leaves
are arranged on alternate areas of the stem.
Flowers are small greenish-cream and grow near the ends of the branches in wattlelike
spikes which are 5 to 12 centimetres long. It flowers in autumn and winter.
Seeds are 10 to 20 centimetre long pods, straight to slightly curved and smooth.
When ripe the pods are straw-coloured, or purplish in some species. Each pod
contains between 5 to 20 hard seeds.
Habitat it is found along waterways, floodplains, roadsides and in horse paddocks.
Weed characteristics can out-compete other vegetation, interfere with mustering
and block access to watering places. Sparse stands will often form into impenetrable
Dispersal happens when seeds are spread in the faeces of animals.
How to act
Mechanical control is most cost effective for initial removal of dense infestations. Windrowing and burning to remove the debris will allow for regeneration of natural vegetation. Cut stump or basal barking is effective for isolated established plants. Young plants can be physically removed. Foliar spraying is most effective when plant is actively growing. Control should be carried out prior to seed set with follow up monitoring and control of emergent growth important. Fire can be a valuable tool to stimulate the seed bank so seedlings can be controlled with herbicide.
Refer to Weed Control Methods.
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