Also known as:
Kariba Weed
South America

General description

Perennial free-floating, mat-forming aquatic fern. Stems are branched and hairy. Submerged leaves are finely dissected, root-like and often bear spores. Emergent leaves are either juvenile, small and well-spaced, or mature, < 4 x 5 cm, crowded and folded about the midrib, with eggbeater-shaped hairs on the upper surface.

What you need to know

To help protect our environment:

  • You must not breed, distribute, release or sell salvinia. As salvinia is a National Pest Plant Accord species, these restrictions apply within the Auckland region and across the whole of New Zealand.
If you see salvinia anywhere, you must report it to the Ministry of Primary Industries on 0800 80 99 66.

Disturbed sites, lakes, rivers, streams, ditches, wetlands, reservoirs.

Vegetative spread from plantlets and fragments, dispersed by water, wind, waterfowl and other animals. Human-mediated dispersal through deliberate releases and movement of contaminated boats, aquatic plants and fish.

Forms extensive mats, outcompeting and displacing native vegetation. Reduces water quality, clogs waterways and creates a drowning risk for humans and animals.

Site Management

Recommended approaches

Do not attempt to undertake control of this species. The Ministry of Primary Industries will carry out the control of this species.

CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.

RPMP status

National Pest Plant Accord Species
Notifiable Organism
Salvinia - Main species image