Best to start seeds indoors 6-8 weeks before last spring frost. Space seeds 1″ apart and barely cover. Keep evenly moist and provide a strong light source until ready to plant outdoors. When large enough to handle, transplant 2″ apart into deeper containers or individual pots. When well established, transplant into rich, well-drained soil in full sun. After flowering, cut spent stalks of bloom back to encourage new flower production.