Bottom-rooted submerged perennial aquatic herb. Stems are < 2 m long and branching. Leaves are < 16 x 2 mm, curved downwards and arranged spirally around stem. Flowers are minute and pink.
To help protect our environment:
Static to moderately fast-flowing freshwater bodies < 6.5 m deep.
Vegetative spread from stem fragments, dispersed by water movement. Human-mediated dispersal through contamination of boats, fishing gear and machinery and deliberate plantings.
Forms dense stands, displacing native aquatic herb species, altering habitat availability for fish and invertebrates, and affecting dissolved oxygen levels. Can impede recreational water access to water bodies.
Very difficult to control once established. Consider an aquatic pest plant control operator. Contact Auckland Council for control options. Spraying aquatic weeds result in plants rotting in the water. This decreases dissolved oxygen in the water and in large amounts can kill aquatic life. Consider pulling out and only spraying regrowth in spring.
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.