I have been growing cleome for several years now - not the same kind I guess, but still cleome. I just wanted to forwarn you to only plant that where you don't mind zillions of babies popping up forever more! I have tried to deadhead my plants each year to keep them from spreading like weeds, but each year I get numerous volunteers anyway.
That said... I really don't mind it too much because I can recognize the baby plants early enough to weed them out before they become a nuisance. They really do make a beautiful statement, and the best thing is that the deer and woodchucks do not eat them! Some say the flowers smell like skunks! They also have very thorny stems - be careful!