Ok, I don't know of the specific case, it is just, that here in germany, the "invasive" species people complain about, I wittnes as a welcome variation. Brings in more color. The areas that do get dominated, will very likely balance it out with a different species, soon.
edit: had to translate it, but: we also have knotweed and people complain, but I actually like it. And I do not see it dominating, just a spot here and there, just like nettles.
edit: had to translate it, but: we also have knotweed and people complain, but I actually like it. And I do not see it dominating, just a spot here and there, just like nettles.