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It's amazing that the tall, dramatic spider flower is only an annual. Once temperatures warm up, it zooms to 4 feet or more plants very quickly and produces large balls of flowers with fascinating long seedpods that whirl out from it. Cut it for vases, but be aware that the flowers shatter easily after a few days. It typically self-seeds prolifically, so you only have to plant it once. Because it develops surprisingly large thorns, it's best to keep spider flower away from walkways.
Plant established seedlings in spring after all danger of frost has passed. Cleome does best in moderately rich, well-drained soil. Be careful about fertilizing or you'll have extremely tall floppy plants. Group in clusters of 6 or more for best effect.