Perennial aquatic bottom-rooted herb. Rhizomes are large and stout. Leaves are ovate and < 30 cm long when floating on water surface, and thin and simple when beneath surface. Flowers have a strong alcohol smell and are yellow, < 6 cm in diameter and held above the water’s surface in spring – summer. Fruit is green and ripens in summer – autumn.
To help protect our environment:
Still or slow-moving water bodies < 2 m deep.
Seeds dispersed by water. Vegetative spread from rhizome fragments, dispersed by water. Human-mediated dispersal through movement of contaminated equipment and deliberate plantings.
Forms dense mats, suppressing submerged aquatic vegetation. Can alter faunal habitat structure and patterns of nutrient storage in sediment. May reduce dissolved oxygen levels.
Follow up treated areas 3 times per year.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.