Bottom-rooted freshwater aquatic. Leaves are strap-like, < 550 x 5 cm and submerged. Male flowers are large, pollen-filled sacs produced at the base of the plant. Female flowers are small, green and produced at the end of a very long, spirally coiled stalk that can extend to the water’s surface.
To help protect our environment:
Static to moderately fast-moving water bodies < 10 m deep.
Vegetative spread from rhizome fragments. Human-mediated dispersal.
Forms dense stands which may displace native submerged vegetation. May impede drainage, exacerbate flooding, and impede recreational water uses. Can cause drowning through entanglement.
Very difficult to control once established.
Do not attempt to undertake control of this species on Aotea/Great Barrier Island group. Please report to Auckland Council if seen on Aotea/Great Barrier Island group.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.