Frogbit (Limnobium laevigatum)
Frogbit is a floating water weed that grows very quickly, forming dense mats over water bodies. In Hornsby Shire it could be found in ponds, aquariums, fish tanks, water features, dams, and waterways, dumped in bushland or roadsides, or being sold online. Frogbit is PROHIBITED MATTER. It is illegal to grow, keep, import, sell or move this plant. You must notify the NSW Department of Primary Industries as soon as you become aware or suspect the presence of this plant. Failure to notify is also illegal. Do not attempt to treat or dispose of the plant yourself. Call the NSW DPI Biosecurity Helpline 1800 680 244. Check your ponds, aquariums, fish tanks, water features, dams, and waterways for this plant.
For information on the identification of frogbit, visit https://weeds.dpi.nsw.gov.au/Weeds/Frogbit