Description
• 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
Problems
• 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
