Watch out for Frogbit

Published on 25 October 2023

The Illawarra District Weeds Authority (IDWA) is asking Illawarra residents to keep an eye out for an invasive weed known as Frogbit.

Frogbit (Limnobium laevigatum), is a highly invasive freshwater plant native to central and South America and has been detected in the Corrimal area.

Known for its rapid growth and ability to form dense mats and choke waterways, Frogbit poses a significant biosecurity risk to NSW.

Chief Weeds Officer David Pomery said finding frogbit in the Corrimal area highlights the risk the weed poses to the Illawarra’s aquatic ecosystems.

"Its aggressive growth can have a devastating impact on aquatic biodiversity as it outcompetes native water plants and reduces light, food and habitat for aquatic animals,” Mr Pomery said.

"Frogbit is a popular aquarium plant and unfortunately is being unlawfully traded online.”

“It is most likely the result of someone illegally dumping frogbit out of their aquarium or pond into the waterway.”

Mr Pomery said the local community had a vital role to play in protecting our waterways by helping stop the trade and spread of these plants.

“If you see frogbit for sale please report it and never dump unwanted water plants in or near waterways.”

Frogbit is regulated as Prohibited Matter in NSW due to the extreme risk it poses to the environment and economy.

Possession, movement, or sale of frogbit in NSW is illegal under the Biosecurity Act 2015.

To make a report contact:

Illawarra District Weeds Authority - (02) 42331129

NSW Department of Primary Industries – 1 800 680 244

Further information: weeds.dpi.nsw.gov.au/Weeds/Frogbit

Photo: Frogbit infestation - Terry Inkson