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© P. Brusselen
© P. Brusselen
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© Contrat Rivière Ourthe

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Aster x salignus


Common name: Common Michaelmas-daisy
Origin: North America
Plant type: Herbaceous
Life cycle: Perennial
Code of conduct: Annex I (consensus list)
Invasive status (ISEIA protocol): Black list
Main ornemental function: Mixed border


This factsheet is common for 3 North American aster species relatively similar, all listed as invasive : Aster lanceolatus, A. novi-belgii, A. x salignus. Herbaceous plants up from 0,9 to 1,5 m tall with lance-like leaves to linear. Aster x salignus is an horticultural hybrid derived from crossing between A. lanceloatus and A. novi-belgii. The inflorescence is resembling a single flower but it is composed flowers clustered on a receptacle. The plants flower in autumn.


Medium spread potential. In Belgium this plant only reproduces vegetatively by rhizomes. No viable seeds are observed in the wild, probably due to the late flowering of this plant.


American asters colonise both ruderal areas (wastelands, railways, roadways, etc.) and wetlands (riverbanks, megaphorbs, alluvial forests, wet meadows, etc.), especially on rich soils.


Species classified A2 in Belgium. Widespread throughout Europe. North American asters are listed as invasive in several countries like France, Switzerland, Austria, Hungary. They can invade habitat of high conservation value like wetlands. Due to their strong vegetative development, North American asters can form dense and monospecific colonies displacing native plant species. In Belgium, only Aster lanceolatus and A. x salignus are present in semi-natural habitats, specially along riverbanks. For more information, click here


Do not plant, do not buy.

Possible native alternative

Main ornemental function

Mixed border

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