Perennial submerged aquatic herb. Roots and rhizomes are slender. Stems are < 2 m long, trailing and leafy. Leaves are ovate, translucent, alternate and basally wrapped around the stem. Flowers are small, green and borne on spikes in November – January. Fruit is olive green and smooth.
To help protect our environment:
Flowing or still freshwater bodies, lakes, streams, ponds, estuaries.
Sets seed. Vegetative spread from stem fragments. Seeds and stem fragments dispersed by water and possibly birds. Human-mediated dispersal through disposal of aquarium waste and movement of contaminated boats, trailers, machinery and equipment.
Can form dense infestations, altering natural habitat structure and blocking waterways. May hybridise with native Potamogeton spp.
Very difficult to control once established. Requires an aquatic pest plant control operator. Contact Auckland Council for control options.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.