Bottom-rooted, submerged, perennial, aquatic herb. Stems are long. Leaves are < 30 x 5 mm, in whorls of four to five. Flowers are white and borne at the water’s surface in November – January.
To help protect our environment:
Static to moderately flowing water bodies < 8 m deep.
Vegetative spread from stem fragments, dispersed by water. Human-mediated dispersal through contamination of machinery and equipment and deliberate plantings.
Forms dense stands, displacing native aquatic plants and altering the habitat structure of macroinvertebrates and fish. Can lower dissolved oxygen levels, increase sedimentation, and alter the primary production and nutrient cycling capacity of water bodies.
Follow up treated areas 3 times per year. Spraying large amounts of aquatic weeds result in plants rotting in the water. This decreases dissolved oxygen in the water and can kill aquatic life. Consider physical control and only spraying regrowth.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.