Emergent, perennial herbs < 2 m tall. Creeping stolons and/or rhizomes and/or tubers. Growth form can vary with level of submergence. S. subulata is smaller than other NZ species. S. montevidensis, S. platyphylla and S. subulata produce pale inflorescences in summer and the seeds ripen in autumn.
To help protect our environment:
Still or slow-moving water body margins < 1 m deep.
Some species set seed, dispersed by water movement, livestock and waterfowl. Vegetative spread from rhizomes and/or stolons and/or tubers. Human-mediated dispersal through movement of contaminated soil, machinery and equipment and deliberate plantings.
Forms dense stands, displacing native aquatic vegetation. Traps sediment, infilling channels and blocking drainage ditches. Impedes recreational activities and may impact mauri of wai māori.
Do not attempt to undertake control of this species. Please report to Auckland Council.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.