NSW DPI Biosecurity is advising that since the flooding of the Hawkesbury River there has been an outbreak of Frogbit (Limnobium laevigatum) in the low-lying regions around Windsor that are likely to have been washed downstream into Hornsby Shire.
Frogbit is a fast growing, floating freshwater weed that forms large, dense mats across the water’s surface preventing native water plants from growing. It has bright green leaves that are usually rounded at the tip, up to 4cm across and glossy on top.
Residents are encouraged to report sightings of Frogbit to the DPI Biosecurity Helpline on 1800 680 244.
You can find more information about Frogbit at the DPI WeedWise website, here: https://weeds.dpi.nsw.gov.au/Weeds/Frogbit