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Canadian Waterweed and Nuttall's Waterweed

 

Canadian Waterweed, Elodea canadensis, and Nuttall's Waterweed, Elodea nuttallii, are aquatic invasive non-native species now found throughout the UK. They live in freshwater as perennial, submerged waterweeds and although they produce small white flowers they only reproduce vegetatively as all plants are female. Canadian Waterweed was first found in Britain in 1842, whilst Nuttall's Waterweed, found in more nutrient-rich water, was not recorded as naturalised in Britain in 1966.

The invasion of the freshwater lochs of the islands by invasive alien aquatic plants threatens their diversity and can have serious detrimental effects on their biodiversity and economic value. Both species of Elodea have been recorded here and it is importance that their distribution is monitored. Their spread can be impeded by ensuring that everyone who uses the lochs for follows the Check-Clean-Dry biosecurity guidance.

Information and Identification Sheet:

Canadian & Nuttall's Waterweeds
SNH Species Action Framework: Invasive non-native plants associated
with fresh waters. A Guide to their identification

 

Canadian & Nuttall's Waterweeds

 

UK Distribution Map

Canadian Waterweed

UK Distribution Map

We regret that distribution maps via the NBN Atlas are not currently available