mikischo, thanks for that, I'll take a look at it tonight, unfortunately I have to shop today. Boring!! LOL. Because it's normally so dry in our area some plants that they say are invasive do not become invasive here, and some can't stand our frosts, but just in case, and in deference to my farming neighbors, the Corncockle won't be getting a chance to grow, let alone spread. I'm glad I asked you all about this one.
Melinda, have you got any photo's of it growing wild? Love to see them if you have.