Rhizomatous, mat-forming perennial grass < 3 m tall. Leaves are erect, < 2.5 m long, harsh, dull grey-green and pointed, with stout midribs. Flowers are borne in < 60 cm long, purple/brown flowerheads in November – December.
To help protect our environment:
Freshwater and saline water body margins, wetlands, tidal flats, pasture, ditches.
Seeds dispersed by water, wind and possibly birds. Vegetative spread from rhizome fragments. Human-mediated dispersal through movement of contaminated soil, boats, equipment, machinery and livestock.
Forms dense clumps, displacing native vegetation and altering habitat structure. Displaces valuable pasture species, clogs waterways and exacerbates flooding.
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.