Mimosa

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Acacia farnesiana

Description

This rounded multi-stemmed shrub or small tree grows to 3 metres tall, occasionally to 5 metres.

Branches are zigzagged and usually grey-brown with white spots.

Leaves are yellow-green and feathery. There are up to 6 pairs of young branches that contain 5 to 20 pairs of narrow rounded leaflets which are 4 to 8 millimetres long. Thorns are found in pairs at the base of each leaf and can grow up to 10 centimetres long. Leaves are arranged on alternate areas of the stem.

Flowers are yellow-orange and ball shaped. They are perfumed and grow on the stalks. It flowers during spring and winter.

Seeds begin as flowers to develop into clusters of slightly curved pods which are up to 6 centimetres long. The cigar shaped pods are dark brown or black and woody at maturity with embedded seeds.

Habitat it is found on trampled or overgrazed areas and watercourses. It does well in dry localities and on loamy or sandy soils.

Weed characteristics it invades forming thickets along watercourses.

Dispersal seeds sprout readily and plants grow rapidly. It is eaten by stock and has good regrowth after grazing.

Declaration Details

This species is not a declared plant under Queensland legislation although its control is recommended.

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 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.

References

Related information

Mimosa © NQ Dry Tropics 2011
Mimosa © NQ Dry Tropics 2011

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