Winter hardy to USDA Zones 5-10. Needs full sun for best flowering. Set out plants, tubers or runners in spring in mud at the margins of a pond or in containers in a water garden, either along the shore or in up to 6-12? of water. Seed may be sown in spring or fall. Seed may also be collected and sown in containers resting in dishes of shallow water. Plants will naturalize by rhizomes and self-seeding. Promptly deadhead spent flowers to prevent any unwanted self-seeding.