why yes, yes she did.
they're lovely though. My mom has a part of her garden set aside for such things. Weed grasses, thistles and whatnot. I don't know if your thistles will spread, but you may want to plant them somewhere confined, a garden lined with railway ties or rocks just in case?
I like to check this site now that I've found it...if it's on there I either don't get it or I make sure it's well confined.
Canada invasive species list