Dianthus carthusianorum is a rather rare and local native species of thermophilous grasslands and calcareous rocky slopes (Lambinon & al. 2004). It is only native in parts of Wallonia (especially river valleys) and absent from Flanders (Van Landuyt & al. 2006). Since the 1990’s Dianthus carthusianorum has been claimed from artificial habitats outside its native distribution area in Belgium. It was then mainly confined to coal mine heaps and obviously introduced on purpose (in so-called wild flower seed mixtures).