Potamogeton crispus
Curled pondweed
Also known as:
Curly pondweed, curly-leaf pondweed
Family: Potamogetonaceae
Origin: Africa, Australia, Eurasia
Regional Pest Management Plan (RPMP) status
- Not a legally declared pest
General description
Perennial, submerged, bottom-rooting aquatic herb. Stems are flattened, < 1 m long and branching. Leaves are alternate, linear, translucent and finely toothed near the tip, with wavy margins. Flowers are small, green and borne on spikes in November – January. Turions are formed in leaf axils and at stem tips.
What you need to know
Although curled pondweed is not a legally declared pest plant, it may still be invasive in some situations. Consider lower-risk alternatives for your garden, such as native plants.
Habitats
Lakes, rivers, streams, ponds, reservoirs, ditches, estuaries, marshes.
Dispersal
Sets seed. Vegetative spread from rhizomes, stem fragments and turions. Propagules dispersed by water and birds. Human-mediated dispersal through movement of contaminated boats, equipment and machinery.
Impact on environment
Forms dense stands, outcompeting native plants, suppressing regeneration and altering habitat structure.
Control
Site Management
Very difficult to control once established. Requires an aquatic pest plant control operator. Contact Auckland Council for control options.
Recommended approaches
Physical control
Method: Pull out.
Plant parts requiring disposal: All parts.
Disposal options: Remove to greenwaste or landfill if practical.
Biocontrol
Biocontrol is currently not available for this species.
Caution: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.
