Winter hardy to USDA Zones 5-10. In water gardens, grow in containers submerged in 6-18? of water in full sun. Leaves tend to emerge in shallow water (6-9?), but mostly float in deeper water (12-18?). Tolerates part shade, but best leaf color is developed in full sun. Thrives in organically rich loams. Also may be grown in the shallow margins of a pond, either in containers or planted in the mud from the water?s edge to 18? deep. Easily grown from seed that should be sown as soon as it ripens (early summer).