Elodea nuttallii (Planch.) H. St. John

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English Nuttall’s Waterweed Status LU: established. 1st record: 1975
Lëtzebuergesch Schmuel Waasserpescht Status EU: established. IAS of Union concern (2017)
Français Elodée de Nuttall RA: ISEIA: A3, Black List. Harmonia+: 0,42
Deutsch Schmalblättrige Wasserpest Wikipedia: Wikipedia - English - Nuttall's Waterweed Wikipedia - Français - Elodée de Nuttall Wikipedia - Deutsch - Schmalblättrige Wasserpest | Wikispecies: Wikispecies - Elodea nuttallii | CABI
Nederlands Smalle waterpest Back to the list of neophytes

Report the species

Report Elodea nuttallii to the National Museum of Natural History.

Brief description

Elodea nuttallii (Planch.) H. St. John is an aquatic plant that thrives in various types of freshwater habitats, from still to slow-flowing systems and from very shallow to deep waters. It is very tolerant to water pollution and prefers warm eutrophic and calcareous waters; it is often found in species-poor macrophyte communities. This submerged perennial makes dense monospecific populations which often colonise whole water bodies, restrict water movement, cut off light, produce anoxic conditions and trap sediments in the system. Due to its quick nutrient uptake and very high growth rate, the species has been reported to outcompete several native aquatic plants (Branquart et al. 2019).

Status and distribution in Luxembourg

Distribution map of Elodea nuttallii (Planch.) H. St. John in Luxembourg. Data source: Recorder-Lux, iNaturalist & GBIF, 2020-01-27.

Elodea nuttallii (Planch.) H. St. John has been first documented by Paul Verheggen in the Upper Sûre lake near Boulaide in 1975 (Parent 1983 cit. in Diederich 1984: 39) 1.

65 records of the species are listed in the MNHNL-mdata online portal (MNHNL, iNaturalist & GBIF 2019). In Luxembourg, it is less common than Elodea canadensis and seems confined to the Gutland.

The species, observed since 1941 in the Netherlands, was harvested in 1939 in northern Belgium, but was only identified later (around 1967). It tends to locally supplant Elodea canadensis Michx. (Lambinon & Verloove 2012: 790).

Risk assessment

ISEIA protocol

ISEIA protocol: A3 (3+3+3+3) = Black List (Ries et al. 2013: 18).

Harmonia+ protocol

Overall risk score 0,42 = (Overall Invasion score 0,71 x Overall Impact score 0,60) (Ries et al. 2020).

Fact sheet

PDF fact sheet of the Nature and Forestry Administration: FR | DE


  • Branquart, E., I. Stiers, L. Triest, S. Vanderhoeven, W. Van Landuyt, F. Van Rossum, F. Verloove, 2019. Harmonia database: Elodea nuttallii (Planch.) H. St. John. Harmonia version 1.2, Belgian Forum on Invasive Species. URL: http://ias.biodiversity.be [accessed on 2019-10-09]
  • Diederich, P., 1984. Les monocotylédones aquatiques (excl. Potamogeton s.l.) du Grand-Duché de Luxembourg. Dumortiera 29-30: 34-41. [PDF 5 MB].
  • Lambinon J. & F. Verloove, 2012. Nouvelle flore de la Belgique, du grand-duché de Luxembourg, du Nord de la France et des régions voisines. Sixième édition. Avec la collaboration de L. Delvosalle, B. Toussaint, D. Geerinck, I. Hoste, F. Van Rossum, B. Cornier, R. Schumacker, A. Vanderpoorten et H. Vannerom. Jardin botanique national de Belgique, Meise. CXXXIX + 1195 pp. ISBN : 9789072619884.
  • MNHNL, 2000-. Elodea nuttallii (Planch.) H. St. John in Recorder-Lux, database on the natural heritage of the Grand Duchy of Luxembourg. Musée national d’histoire naturelle, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-09-05]
  • MNHNL, iNaturalist & GBIF, 2019. Elodea nuttallii (Planch.) H. St. John in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: https://mdata.mnhn.lu [Accessed 2019-09-06]
  • Parent, G. H., 1983. Données floristiques inédites tirées de l’herbier du docteur Paul Verheggen. Dumortiera 25 : 12-21.
  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]
  • Ries, C., Y. Krippel & M. Pfeiffenschneider, 2020 [submitted]. Risk assessment after the Harmonia+ protocol of invasive alien vascular plant species in Luxembourg. Bulletin de la Société des naturalistes luxembourgeois.

 Page content last updated on 2020-01-24. Last proofread by Caroline Grounds on 2019-11-17.