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