I have a lot of this plant. It is one of the best plants there is for bees. There are 7 bees in this picture...
sounds like a spell from that boy Harry Potter!
It does. Dolores Umbridge would know about that.
What I would like to know is is it a thug, If so how much of one.
Many gardeners would regard this plant as a thug. Seed catalouges use euthemisms such as 'robust' and 'good for the back of the border'.
It seeds itself around very readily too. At least, it does in my garden,
Personally, I don't have any problem with it, and wouldn't be without it.