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Curly waterweed

Curly waterweed  Lagarosiphon major

Photo: RPS group Plc


  • Appearance: Submerged, perennial freshwater plant, strongly curved leaves that spiral or whorl around stem, branching stems up to 3 metres in length.


  • Growth: Found in still or slow flowing water, vigorous growth, small fragments can regrow.


  • Impact: Negative impact on aquatic ecosystems, outcompetes native plants, affecting biodiversity and causing water quality issues. Can affect the amenity value of lakes and ponds by reducing access.


  • Pathway: Deliberate release or improper disposal of this aquarium and pond plant into the wild.



  • What to do if you see Curly waterweed for sale or other offences being committed: Make a report by following the guidance here.


  • What to do if you see this plant in the wild: Record it with a photograph (where possible).