Sagittaria Suitable for bogs and shallow water, Sagittaria sports large, pointed leaves 2-3 feet above water. It goes by the common name arrowhead. This is a hardy native plant with large, white flowers borne on spikes in mid- to late summer. Grow in water 2-6 inches deep. Foliage is sometimes variegated.
Propagation is by division.
Hardy water lilies will survive outdoors year-round, provided roots are covered sufficiently with water or soil that prevents them from freezing. Their leaves and flowers float on the surface of the water. Tropical lilies, both day and night bloomers, are dependably hardy only in frost-free climates. In colder areas they can be grown as annuals. Their leaves float, and their fragrant flowers are held well above the surface on stout stems.