Fanwort (Carolina water-shield) Cabomba caroliniana
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An invasive, non-native plant.
This is species is similar to the other waterweeds mentioned above in that it is a fully submerged aquatic plant that can grow to 2 metres long.
What's the problem?
It also grows very densely and so displaces native species as well as clogging up waterways. It is a popular aquarium plant and although currently rare in the wild in UK has been reported from canals where aquarium plants have been dumped. It has become invasive in a number of other countries and could potentially spread in the UK if our climate becomes warmer, especially as it easily spreads via stem fragments which makes management difficult.
Rapid Risk Assessment
***** Critical Risk
This species is listed on Schedule 9 of the Wildlife and Countryside Act in England and Wales therefore, it is also an offence to plant or otherwise cause to grow these species in the wild.