I bought seeds for a "black" columbine. It came up and grew and reseeded all over. Only problem I hated the flower, nearly black with some white. I keep pulling out plants when I found them but couldn't seem to keep ahead of it. Four our five years ago, some out-of-town friends were visiting and say it and commented on wanting some. I gladly gave them a trowel, come potting soil and plastic bags. They were very diligent and got took all. Yes, I saw it in there garden; they love it. I've managed to finally get rid of it in years since. One person's weed is another person's treasure.