Submerged aquatic perennial < 7 m tall. Stems are branched and may anchor to sediment or form free-floating mats. Leaves are long, narrow, branched and whorled, with complex architecture. Flowers are minute.
To help protect our environment:
Freshwater bodies < 15.5 m deep, drainage ditches.
Vegetative spread from stem fragments, dispersed by water. Human-mediated dispersal through contamination of boats, fishing gear and machinery and deliberate cultivation.
Forms dense stands and displaces native submerged vegetation down to 15m depth. Alters water flow, increases flooding risk and impedes recreational access of water bodies. Likely to negatively impact kōura.
Do not attempt to undertake control of this species on Aotea/Great Barrier Island group. Also site led control is carried out by Auckland Council at other priority lakes. Please report to Auckland Council if seen.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.