Ludwigia grandiflora (Michx.) Greuter & Burdet

English Water primrose ISEIA: A0 – Alert List. IAS of EU concern (2016)
Lëtzebuergesch n/a EASIN | CABI
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Importance and distribution in Luxembourg

The species has not yet been observed in Luxembourg.

L. grandiflora is an amphibious species living in ponds, lakes, ditches, channels and slow-running rivers as well as in humid meadows. It shows a high tolerance to different water levels. Its growth is favoured by water eutrophication but the plant is able to develop in oligotrophic environments. Invasive spread across watersheds is almost exclusively clonal and brought about by the dispersal of vegetative propagules by waterflow. Water primroses are highly detrimental to the environment in Western Europe. They quickly develop and make very thick monospecific floating carpets at the surface of water bodies. They alter the physico-chemical quality of water (reduction of light and dissolved oxygen) and possess an allelopathic activity that influences the water quality throughout the year and reduces the germination and survival rates of other plant species. They outcompete most of native water plants and create an anoxic environment detrimental to many plant and animal species. In addition, they modify water flow and cause wetland drying. (Source:

Risk assessment

ISEIA protocol: A0 (3+3+2+3) = Alert List. First assessed 24 January 2019 by Manou Pfeiffenschneider and Christian Ries.



Suggested citation of this webpage

Ries, C. & M. Pfeiffenschneider (Eds.), 2019. Ludwigia grandiflora (Michx.) Greuter & Burdet. In: - Invasive Alien Species in Luxembourg. National Museum of Natural History, Luxembourg. URL: [Accessed 2019-10-19].

 Last updated on Thursday, January 24, 2019.