Submerged, bottom-rooting freshwater, aquatic < 5 m tall. Leaves are in whorls of three. Flowers are small, white/purple, five-petalled and borne at water’s surface November – January.
To help protect our environment:
Still and slow-moving water bodies < 10 m deep.
Vegetative spread from stem fragments. Human-mediated dispersal through contamination of machinery and fishing equipment and deliberate releases.
Can reduce flow velocity and impede gas exchange in freshwater ecosystems, lowering dissolved oxygen levels and increasing sedimentation. May impede water flow in drains, exacerbating flooding.
Very difficult to control once established.
Do not attempt to undertake control of this species on Aotea/Great Barrier Island group. Please report to Auckland Council if seen on Aotea/Great Barrier Island group.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.