Even though the group in San Antonio is selecting for pink, and I do like pink, I still love the blue, purple and white larkspur. Another prolific re-seeder is the cleome. Cleome has long been a southern favorite but the newest colors are still rare as I travel around. A few years ago the Queen series was developed. There are rose, pink, cherry and violet in this Queen group.
Cleomes have a pungent leaf odor when touched but otherwise they are outstanding plants.
I have seen some gorgeous arrangements using their flowers in a vase. Hummingbirds also find this plant a delicacy. Last year's Mississippi Medallion winner, Melampodium, is another excellent re-seeder. The Melampodium, or butter daisy, is one of those plants that literally blooms from early spring until frost with yellow daisy-like flowers. If it is not perennial, it is definitely one that will re-seed.