Aquatic perennial growing from a round tuberous rhizome. Floating oblong leaves (<25 cm) with parallel veins and long stalks (<1.2m). Fragrant white flowers (<1cm) with one fleshy petal. Flowers are on opposite pairs on a Y branched spike above the water. Green spongy coated seeds.
Still or slow moving shallow fresh water. Dams, ditches, streams and lakes.
Seeds prolifically, seeds dispersed by water.
Forms mats on water surface. Blocks waterways, can contribute to flooding.
1. Mechanical removal
2. Spray emergent foliage (200ml glyphosate/10L, use glyphosate formulation approved for use over water). Repeat as necessary.
3. Grass carp: requires consent, contact DOC.
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.