Erect, clumping, perennial grass < 2 m tall. Rhizomes are creeping and can form mats that attach to a bank but float in deeper water. Leaves are < 2 cm wide. Flowers are yellow/green with a purple tinge and are borne in spikelets on branched flowerheads < 45 cm long during spring – summer. Seeds are small, dark brown and borne in summer – autumn.
To help protect our environment:
Still and slow-moving eutrophic water bodies < 1.5 cm deep, wetlands, drains.
Seeds dispersed by water. Vegetative spread from rhizomes, dispersed by water. Human-mediated dispersal through movement of contaminated soil, machinery and equipment.
Forms dense mats, trapping sediment, accumulating decomposing vegetation and altering stream morphology, dissolved oxygen levels and other biophysical properties.
Follow up treated areas 3 times per year. Encourage natural regeneration of native plants or replant treated areas where possible after 2-3 treatments to establish dense ground cover and minimise reinvasion.
CAUTION: When using any herbicide or pesticide please read the label thoroughly to ensure that all instructions and safety requirements are followed.