Aquatic Invasive Weeds identification

Floating Pennywort is an herbaceous, hardy, perennial aquatic plant, usually found in watercourses rich in nutrients. The weeds float on the surface, and form dense mats. The plants have many roots that are thin and fibrous. Parrot’s Feather can grow on land and in water, and is a rhizomatous perennial. Its stems reach several metres long, and like the above, cover watercourses in thick carpets of vegetation. Similar to Japanese knotweed, its rhizomes are brittle and the plant can propagate itself by growth of the small fragments of parent plants. Australian Swamp Stonecrop can take root from a single node and stem fragment of 5mm in length, and can be identified by its pretty white flower. Severe oxygen depletion can occur below dense growths of this plant. The plant assimilates CO2 for 20 hours of the day when submerged due to crassulacean acid metabolism and grows throughout the year; there is no dormant period.

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