Itch Grass

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Rottboellia cochinchinensis


Erect annual perennial grass grows to 3 metres. It is also a free-floating water weed.

Stems are cylindrical, hollow and branched from the upper nodes.

Leaves are arranged opposite each other on the stem. They are flat and blue-green in colour and are covered in stiff hairs.

Flower heads branch from the upper nodes and have spikes that are up to 10 centimetres long. It flowers during spring and summer.

Habitat itch grass is usually found in stands of sugarcane or around headlands in Queensland.

Weed characteristics stiff hairs cause irritation to pedestrians moving through it. It is an aggressive perennial grass that is highly adaptable to land and water.

Dispersal seeds are the only means of propagation.

Declaration Details

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

How to act

This plant can be controlled by spot spraying with an appropriate herbicide. Painting the foliage with a wiper covered in chemical-soaked wick or carpet may be an effective treatment if growth rates are appropriate.

Refer to Weed Control Methods.


Related information

Itch Grass © NQ Dry Tropics 2011
Itch Grass © NQ Dry Tropics 2011

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