Asclepias syriaca L.

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English Common milkweed Status LU: n/a. 1st record: n/a.
Lëtzebuergesch Gewéinlech Seidplanz Status EU: established. IAS of EU concern (2017).
Français Asclépiade commune RA: ISEIA: B0, Alert List. Harmonia+: 0,19
Deutsch Gewöhnliche Seidenpflanze Wikipedia: Wikipedia - English Wikipedia - Français Wikipedia - Deutsch Wikipedia - Nederlands | Wikispecies: Wikispecies | CABI
Nederlands Gewoon zijdeplant Back to the list of neophytes

Report the species

Report Asclepias syriaca to the National Museum of Natural History.

Brief description

Asclepias syriaca sl 2

Asclepias syriaca on ballast near Karnabrunn, district Korneuburg, Lower Austria. Photo: Stefan.lefnaer, 30 June 2012.

Asclepias syriaca L. originates from North America and is cultivated as an ornamental. It was introduced into European countries from France to Bulgaria and Russia (potentially invasive) (EPPO 2019). A. syriaca colonises a variety of communities from woodlands to cleared grasslands and marshlands. It grows in clumps or patches in meadows, fencerows, roadsides, railways, waste places, reduced-tillage fields, and other open habitats (CABI 2010). Larger populations can displace native plant and animal species, especially if the species penetrates into habitats worthy of protection. The large leaves shade the soil and thus prevent the emergence of other species (Anonymous 2014).

In 2014, Switzerland added Asclepias syriaca L. to its List of Invasive Alien Plants (EPPO 2019, Anonymous 2014).

IAS of Union concern

In 2017, Asclepias syriaca L. was added to the list of invasive alien species of Union concern (Anonymous 2017) which implies that member states shall take all necessary steps to prevent it’s unintentional introduction or spread.

Status and distribution in Luxembourg

Asclepias syriaca L. has not yet been observed in Luxembourg (MNHNL, iNaturalist & GBIF, 2020).

Risk assessment

ISEIA protocol

B0 (3+2+2+2) = Alert List. First assessed 22 November 2019 by Christian Ries.

Harmonia+ protocol

Overall risk score 0,19 = (Overall Invasion score 0,52 x Overall Impact score 0,37) (Ries et al. 2020).


Worldwide distribution


  • Anonymous, 2014. Asclepias syriaca in: Info Flora – Das nationale Daten- und Informationszentrum der Schweizer Flora. URL:
  • Anonymous, 2017. Commission implementing regulation (EU) 2017/1263 of 12 July 2017 updating the list of invasive alien species of Union concern established by Implementing Regulation (EU) 2016/1141 pursuant to Regulation (EU) No 1143/2014 of the European Parliament and of the Council. Official Journal of the European Union L 182: 37-39 (13.7.2017).
  • CABI, 2010. Asclepias syriaca L. [original text by Claire Teeling]. In: Invasive Species Compendium. Wallingford, UK: CAB International. URL: [accessed 2019-11-22]
  • EPPO, 2019. EPPO Global Database: Asclepias syriaca L. URL: [accessed 2019-11-22]
  • MNHNL, iNaturalist & GBIF, 2020. Asclepias syriaca in MNHNL-mdata, online portal combining species observation from Recorder-Lux, iNaturalist and GBIF. National Museum of Natural History, Luxembourg. URL: [Accessed 2020-02-28]
  • Ries, C., Y. Krippel & M. Pfeiffenschneider, 2020. Risk assessment after the Harmonia+ protocol of invasive alien vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 122: 197-205. [PDF 132 KB]

 Page content last updated on 2020-04-29. Last proofread by Caroline Grounds on 2019-11-27.