Origin: Eurasia and Africa
Regional Pest Management Plan (RPMP) status
- Unwanted organism
Perennial submerged rhizomatous aquatic herb. Stems are long, branching and smooth. Leaves are soft, pinnate, feather-like and borne in whorls of four. Flowers are small, yellow and borne on emergent spike. Fruits contain four seeds.
What you need to know
To help protect our environment:
- You must not breed, distribute, release or sell Eurasian watermilfoil. As Eurasian watermilfoil is an Unwanted Organism, these restrictions apply within the Auckland region and across the whole of New Zealand.
Rivers, lakes, streams, reservoirs, ponds, drains, tidal creeks, bays.
Sets seed. Vegetative spread from runners and stem fragments. Seed and stem fragments dispersed by water. Human-mediated dispersal through movement of contaminated boats, equipment and machinery.
Impact on environment
Forms dense mats, outcompeting native plants and altering habitat structure. Impedes drainage and recreational activities.
Do not attempt to undertake control of this species. Please report to Auckland Council.
Caution: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.