Perennial aquatic reed, < 3 m tall. Rhizomes form a thick mat. Leaves are wide, flat, stiff and pale grey/green. Flowers are borne in erect, sausage-shaped, dark brown/black inflorescences. Fruit is tufted and appears in early summer.
To help protect our environment:
Wetlands, water bodies and margins < 1 m deep.
Seeds dispersed by wind, water and animals. Vegetative spread from rhizomes. Human-mediated dispersal through contaminated machinery.
Forms dense thickets, suppressing native vegetation and altering flow regimes. Potential to directly compete or hybridise with threatened taonga species raupō.
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.