It has another common name that I would think appease little boys... Snotweed.
I guess it depends on so many factors as to whether or not it is a vigorous grower/spreader. Except for seeing some in the ditch, I've not had any leave the area where we put the original seedlings. The clumps just have grown larger.
I've never tried it, but may with a plant or two next year to see what it does. Some people will cut down some of the growth before it flowers to avoid the "flop".
This Ohio variety is the most common. I also have the Virginia and Prairie Cow Slobbers. I purchased the prairie ones after their bloom time, so do not know what color they will be. The Virginia are a deep gorgeous purple. That's my favorite color.
Maybe there is a hybrid or cultivar that is tame. I really like things "wild", but I have found they sometimes make bathrooms for feral cats.
I pulled thistle yesterday and placed it in bare spots under the patch where I smelled cat urine.