There are no less than 15 plants that include “devil” in their common names. One particularly colorful plant is devil’s thorn, Solanum pyracanthum. This tomato and eggplant relative is both frightening and gorgeous. If you grow it from seed starting in early May, by Halloween it should be 2 feet tall and covered in bright orange spines. Keep this one out of reach of trick-or-treaters, though. The prickles poke if handled roughly and the plant bears mildly poisonous fruits. This one earns its common name.