Emergent rhizomatous perennial herb < 6 m tall. Leaves are alternately arranged in two rows up the stems. Flowers are borne in erect brown cylindrical spikes usually < 2 cm in diameter. Achenes attached to hairs.
To help protect our environment:
Wetlands, riparian margins, estuaries, ditches.
Seeds dispersed by wind, water and attachment to animals. Vegetative spread from rhizomes. Human-mediated dispersal through movement of contaminated clothing, soil and equipment.
Can form dense infestations and displaces native species such as raupō.
Consider engaging a pest plant control operator to control large infestations. Follow up treated areas each year.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.