Also known as:
Kariba Weed
South America

General description

Small floating aquatic fern forming extensive mats. Light green to brown-green rounded leaves overlapping, folded, with upper surfaces covered in hairs.

Still freshwater: ponds, lakes, swamps. Requires high light, high temperatures. Frost tender.

No fertile spores in NZ. Fragments break off, dispersed by water,dumping of garden pond debris.

Shades out species underneath; prevents water oxygenation seriously degrading natural character of waterbody.

Site management

Report all sites to MAF, control under their direction. Wind moves plants during clearance. Once cleared, infestations should not recur.

Recommended approaches

1. Rake & mulch. Limited follow up for plants missed.
2. Spray edges where weed cannot be raked with diquat at label rates.
3. Flush out infestations near sea with saline water.

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

Search tags

RPMS status

Surveillance - Whole Region
National Pest Plant Accord species - nationwide
salvinia - Main species image