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Large, smoky-purple, daisy-like flowers bloom in summer on 3–4 ft tall spiny stems. They are so unusual that they usually require a double take from uninitiates. And...drum roll...they are one of the few deer-proof (as opposed to deer-resistant) plants. Not even young deer are so bold as to sample them. Keep in mind that they send down a tap root that insists upon staying put and not being moved about willy-nilly. South African.Minimum temperature: 0° F