This introduction from Australia or New Zealand is believed to have come from vegetation thrown out by home aquarium owners. It has become a nuisance plant creating dense mats of vegetation on the surface of ponds and along the edges in the mud. C helmsii can be so dense as to look like dry land which creates a danger for children and pets. In winter it doesn't die back very much so once established it tend to increase year on year.
Pond Near Rudheath, Cheshire 3rd September 2005
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Added on 3rd September 2005