Cephalaria gigantea (Ledeb.) Bobrov (syn.: Scabiosa gigantea Ledeb.) (Caucasus) – A very rare escape from cultivation or garden throw-out. Discovered in Scheldewindeke in the valley of riverlet Molenbeek in 2006 (shady, rather nitrophilous and damp habitat) and near a garden in Ieper in 2008. More or less temporarily established in few numbers but probably not really becoming naturalised. Cephalaria gigantea rather requires a sun-exposed and well-drained habitat.
Cephalaria gigantea is increasingly cultivated in private gardens and more records of escapees are expected.
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References:
Wallnöfer B., Strudl M. & Pokorny M. (2015) Über fremdländische Arten von Cephalaria (Dipsacaceae), Gilia (Polemoniaceae), Ornithopus (Fabaceae) und Trachystemon (Boraginaceae) in Österreich. Stapfia 103: 151-159. [available online at: http://www.zobodat.at/pdf/STAPFIA_0103_0151-0159.pdf]