I read that cornmeal is like birth control to weeds and prevents sprouting?, interesting. Anyway back to the Evening Primrose, I did take some from the flower bed of the rented property to my new yard where I have a area it could just go wild if it wanted to and figured it would catch on like wild fire, it never took!, just when I finally had the perfect place for it. So over there I could not get rid of it and here I could not get it started.