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•    Semi-aquatic, mat-forming freshwater herb
•    Hairy leaves up to 18cm long with prominent veins and midrib
•    Upper stems are 4-angled
•    White flowers occurring in whorls just above leaf junctions
•    Spindle-shaped seed capsule – 7mm long

Flowering Times

•    Flowers all year round

Control Measure

•    Physical – hand pull small plants
•    Herbicide


•    Easily spread by seed sticking to animals, humans, machinery
•    Spreading stems sprout roots on contact with the soil
•    Chokes waterways and wetlands
•    Displaces native plants and animals

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