Gamba Grass

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Andropogon gayanus


This is a perennial tussock grass that grows up to 4.5 metres. The tussocks can grow to 70 centimetres wide. The root system spreads up to 1 metre from the tussock, close to the surface. Leaves are 30 to 60 centimetres long and up to 3 centimetres wide, with a distinctive white midrib and covered with soft hairs.

Stems are robust and covered in soft hairs.

Seeds are contained in a fluffy v-shaped seed head consisting of up to 6 groups of branches, each containing 2 to 18 primary branches.

Flowers in April.

Habitat it invades woodland and grassland communities with annual rainfall of 400 and 1,500 millimetres.

Weed characteristics infestations can alter soil nutrient cycles, water cycles and fire regimes. The plant’s high biomass can fuel intense bushfires. It competes with native pasture and invades non-grazed land such as conservation areas.

Dispersal is wind borne and is also transported as hay and on road side slashers. It spreads rapidly where natural vegetation is disturbed.

Declaration Details

This species is a Class 2 declared plant under Queensland legislation.

How to act

Spot spraying with a glysophate herbicide is the only effective treatment. Mechanical clearing or slashing can reduce standing vegetation, allowing access for herbicide treatment. Fire is not recommended for control with this grass.

Refer to Weed Control Methods.


Related information

Gamba Grass © NQ Dry Tropics 2011
Gamba Grass © NQ Dry Tropics 2011

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