Dianthus barbatus L. (S-Eur.) – A rare and usually ephemeral escape from cultivation. First collected in 1867 along river Meuse in Argenteau. Subsequently seen in several, widely scattered locations but by far most regularly so in Wallonia (e.g. Fraipont, Hastières, Poilvache, Vierset-Barse, etc.). In the past decades apparently much rarer and only rarely collected. Recorded for instance between Han-sur-Lesse and Rochefort along riverlet Lhomme in 1960 and on the banks of the Zuid-Willemsvaart near Maasmechelen in 2009. A complete and up-to-date overview of Belgian observations is available here: http://waarnemingen.be/soort/view/6691. It is usually found on talus slopes, river banks or road verges, more rarely on old walls.
Dianthus barbatus is still cultivated in gardens but probably less so than in former times.
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Selected literature:
Alonso T. (1981) Dianthus barbatus. Jard. Paisaje 10(72): 81-82.