Eel Grass - Lake Pupuke Variety

Also known as:
Vallisneria Gigantea
Europe, Asia, Africa & Australia.

General description

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.

Site management

Only treat if necessary, interference often makes problem worse. Regular follow up required.

Recommended approaches

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.

Similar species

Sagittaria platyphylla

Sagittaria's submerged leaves look similar to eelgrass. Has erect leaves and flowers that are absent in eelgrass.

eel grass - Meola Creek variety
Vallisneria spiralis

V. gigantea is a larger plant than V.spiralis. V. spiralis flower stalk is twisted in a spiral.

Search tags

RPMS status

Surveillance - Whole Region
National Pest Plant Accord species - nationwide
eel grass - Lake Pupuke variety - Main species image