Fallopia sachalinensis (F. Schmidt Petrop.) Ronse Decr.

English Giant knotweed, Sakhalin knotweed ISEIA: B1 – Watch List
Lëtzebuergesch Sachalin-Knuetkraut EASIN
Français Renouée de Sakhaline Wikipedia: Wikipedia - English - Giant knotweed Wikipedia - Deutsch - Riesen-Knöterich Wikipedia - Nederlands - Sachalinse duizendknoop
Deutsch Sachalin-Staudenknöterich, Riesen-Knöterich Wikispecies: Wikispecies - Giant knotweed
Nederlands Sachalinse duizendknoop Back to the list of neophytes

Report the species

Report Fallopia sachalinensis to the National Museum of Natural History.

Importance and distribution in Luxembourg

Distribution map of Fallopia sachalinensis (F. Schmidt Petrop.) Ronse Decr. in Luxembourg. Data source: Recorder-Lux & iNaturalist, 2019-09-21.

The first documented occurrence of the species in Luxembourg dates from 1959. It was found by Léopold Reichling on 14th May 1959 in Lëtschet (Municipality of Steinsel). There are 98 observations indicated in the Recorder database (18/01/2018).

Giant knotweed is less common and less widespread in Luxembourg than its relative, Bohemian knotweed (Fallopia ×bohemica), an hybrid with Japanese knotweed (Fallopia japonica). It sometimes builds huge colonies along riparian ecosystems, as can be seen along the river Alzette in Luxembourg-City, beside the Neumünster Abbey in the Grund area of ​​the city.

It is mostly found as an ornamental plant in private gardens. Populations in the wild are the result of people fly-tipping their knotweed clippings.

As part of a study for the Department of Ecology section of the National Museum of Natural History, samples of 31 specimens of Fallopia species have been collected in 2017. The sampled specimens were described and leaves and stem parts were collected for integration in the museums herbarium. The samples have been subjected to genetic analysis by the museum’s lab. The results show that F. x bohemica is much more common than Fallopia japonica. The distribution data of both species need to be updated.

Giant knotweed bordering the Alzette river in Lux.-Grund.

Giant knotweed bordering the Alzette river in Lux.-Grund.

Risk assessment

ISEIA protocol: B1 (2+2+3+3) = Watch List (Ries et al. 2013: 18).

Bibliography concerning Luxembourg

  • Albers, M., S. Kohn, J. Steng & M. Pfeiffenschneider, 2001. – Problematik der Bioinvasion. Kartierung von Japan-Knöterich, Riesenbärenklau und Indischem Springkraut an Woltz, Clerve und Wiltz. Ergebnisse der Kartierung. – Studie des Büros ERSA im Auftrag von: Administration des eaux & forêts, arrondissement nord. August 2001. 7S. + Anhang.
  • Glesener, B., M. Pfeiffenschneider & C. Ries, 2009. Die Verbreitung von Impatiens glandulifera, Fallopia japonica, F. sachalinensis, F. ×bohemica und Heracleum mantegazzianum entlang der Hauptfließgewässer Luxemburgs. Bull. Soc. Nat. luxemb. 110 : 69-73. (pdf)
  • Pfeiffenschneider, M., 2001. – Problematik der Bioinvasion. Nationales Inventar von Riesenbärenklau, Indischem Springkraut und exotischen Knötericharten. Ergebnisse einer Umfrage und Konzept zur Bekämpfung der Riesenbärenklaubestände. – Studie des Büros ERSA im Auftrag von: Administration des eaux & forêts, Service de la conservation de la nature, November 2001. 23 S. + Anhang, Luxembourg.
  • Pfeiffenschneider, M., 2007. Über die Verbreitung von Heracleum mantegazzianum, Impatiens glandulifera, Fallopia japonica und F. sachali­nensis entlang der Gewässer Obersauer, Woltz, Clerve, Wiltz und ihrer Nebengewässer (Luxemburg). Bull. Soc. Nat. luxemb. 108 : 7-10. (pdf)
  • Pfeiffenschneider, M., 2008. Neophyten in Luxemburg – Projekt Bioinvasion 2007. Arbeitsbericht. 18 S. (pdf)
  • Pfeiffenschneider, M. & M. Owaller, 2000. – Kartierung von Japan-Knöterich, Riesenbärenklau und Indischem Springkraut an der Obersauer. Theoretische Grundlagen und Ergebnisse der Kartierung. – Studie des Büros ERSA im Auftrag von: Administration des eaux & forêts, acrrondissement nord. August 2000. 37S. + Anhang, Luxembourg.
  • 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]

Suggested citation of this webpage

Ries, C. & M. Pfeiffenschneider (Eds.), 2019. Fallopia sachalinensis (F. Schmidt Petrop.) Ronse Decr. In: neobiota.lu - Invasive Alien Species in Luxembourg. National Museum of Natural History, Luxembourg. URL: https://neobiota.lu/fallopia-sachalinensis/ [Accessed 2019-09-21].

 Last updated on Tuesday, July 23, 2019.