Knotgrass

Species: Paspalum distichum

weed identification

common name
Knotgrass, Water Couch, Water Finger-Grass, Couch Paspalum, Eternity Grass, Gingergrass, Thompson Grass
description

Fast growing perennial grass up to 60cm tall. Flowers are green to purplish-brown and are usually divided into two branches that resemble the letter Y. The aquatic plant flowers between the months of February and May.

habitat

Water course edges, near dams, ponds and waterways that aren’t always under water.

distribution
NSW, QLD, SA, TAS, VIC, WA
native or exotic?
Exotic
reproduction

Reproduces via seed and vegetatively.

dispersal

Spreads via rhizomes and stolons.

benefits

Food source for several bird species.

What does Knotgrass look like?

Use these images below to help you decide whether you are dealing with Knotgrass.

Disadvantages of Knotgrass

It has become a major weed of rice and many other crops, as well as occurring in uncropped wetlands in both its native and introduced regions.

  • Dense infestations may cause deoxygenation of the water
  • May outcompete other aquatic plants
  • Dense infestations may cause fish and other aquatic life death

treatment

AQ200 Aquatic Herbicide + Wetting Agent – Chemical Herbicide designed to kill emergent weeds quickly. Use on mild to severe infestations.

Aquatic Weed Rake and Razor Combo – DIY physical removal. Ideal for mild infestations, sensitive water bodies or to aid herbicide treatment.

Aquatic Harvesting – Large amphibious machine that cuts and clears emergent aquatic weeds. Book this service for severe infestations or for larger water bodies.

prevention options

Aerating Fountains – Reduces the severity and likelihood of aquatic weed infestations. Use in any body of water.