Submerged perennial freshwater <5.5m high depending on habitat. Bottom-rooting, stout rhizomes, forms dense beds. Light green leaves long ribbon-like at regular intervals along rhizomes. Size of plant depends on habitat.
Static or flowing freshwater systems <9m deep. Tolerates low salinity. Grows fastest in water temperatures of 25°
Male plants only in NZ, no viable seeds. Spread locally by rhizomes. Intentional planting into new water bodies.
Dense beds of vegetation block dams & waterways impeding drainage, disrupting recreational activities, choking hydro turbines. Out-competes native species.
Only treat if necessary, interference often makes problem worse. Regular follow up required.
1. Virtually impossible to eliminate. Control small infestations using divers to hand-pull plants.
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.