Well they do attract hummingbirds. They are hard to kill once they've got a spot they like. We've not had the underground root popping up all over problem but they make a lot of seed and some have spread here and there, still, in the early stage they can be eradicated. Our's has grown over the roof of the garage and has tried to insert itself between the siding. We've been able to catch and detach those runners. A couple of years ago we took a chain saw to the mother plant, it just came back the next year. It does produce a lot of flowers and is a pleasant sight to behold. It was here when we bought the place. At this point we seem to continue to just co-exist.
