Irish wildflowers BSBI map

Canadian Waterweed, Elodea canadensis, Tím uisce
Photographs: © Dr. Michael Millane

Canadian Waterweed
Elodea canadensis
Tím uisce
Family: Hydrocharitaceae

Flowering July-August. Submerged aquatic perennial. Introduced.

Inconspicuous pinkish flowers but only female flowers are produced and all reproduction is vegetative. The transluscent dark-green leaves are usually in whorls of 3. Stems to 3m.

The first Irish record was in 1836 and now widespread in slow-moving or still water to a depth of 3m+. It is replaced in some locations by Nuttall's Waterweed. Listed as an invasive plant in Ireland.

Thank you to Dr. Michael Millane, Inland Fisheries Ireland for correcting the photographs previously shown, which were of Nuttall's Waterweed, E. nuttalli

Canadian Waterweed, Elodea canadensis, Tím uisce
Canadian Waterweed, Elodea canadensis, Tím uisce

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