8. Panicum virgatum L. (N-Am.) – Increasingly planted for ornament (in private gardens as well as in public places) and sometimes escaping or found as a garden throw-out in road verges or on dumps. Recently seen, for instance, in Mol (see also http://waarnemingen.be/waarneming/view/49846843). In 1948 also recorded as an ephemeral wool alien in the Vesdre valley.
Perhaps often persisting for some time (dense perennial clumps) but probably not really becoming naturalised so far.
d’Alleizette Ch. & Loiseau J. (1952) Les Panicums de la Loire Moyenne. Le Monde des Plantes 291-292: 41-42.