I started some annual Osteospermum pluvialis (African Moon) and Osteospermum sinuata (African Sun) from T&M seeds last year and loved them. They do beautifully in poor soil, LOVE hot weather (worst drought in memory here in MD last year) and bloomed continually with deadheading. I liked them so much I have started seedlings again this year, and added the "Tetra Sunshine Giants" variety of pluvalis and Osteospermum hybrida Giant Mixed. You can start these from seed as late as mid-May to early June and still get bushels of flowers until first frost. They grow very quickly, fill empty spots in the garden beautifully and flower profusely. They are also great for children, because they germinate in days, so you get some "instant gratification." They do tend to get leggy when started indoors, but it's warm enough now to start them outside on the deck, or right in the garden bed. They make good cut flowers for arranging, although the blooms do close at night and re-open each morning. (CaptMicha - I'm 10 min. away if you'd like to have a couple of samples or some leftover seeds.)
I've had some interesting crosses from seed - a spooned white and a purple gave some sort of spooned lavendar and almost pink blooms one year. Unfortunately, I lost the plants to an unexpected frost last year and the seed, so will have to buy some new and see what I can come up with next year. Up here, they bloom all summer.
I loved these last year just when the petunias were petering out they kicked in... i started some indoors ... boy did they get leggy... i didn't know to pinch them so thanks... and now plan on doing cuttings this fall