Some of them are, but most half & half, with some in shade. They are either biennial or short lived perennial plants, but they self seed with profusion. I have found that ones which do flower for a second year running tend to run out if steam & don't put on such a good show & then usually die after that, so that may be all that's going on with yours Mark?
@jeatacake thanks. I picked up some white and the tag said 6 hours of sun, but I usually find with our super hot sun and high humidity they won't take it and I've always read they do better in mixed shade at the edge of woods. We'll see what happens.