Arrowhead produces stalks of delicate white, 3 petaled flowers above arrow-shaped leaves, from early until late summer reaching 2 to 3 feet tall. Plants emerge in spring later than many other marginal plants. Plant in containers lest it spread too aggressively. Needs wet soil or will grow in water up to 6 inches deep. Grow in full sun or in partial shade. Arrowhead has edible roots and is known by a variety of names: duck potato, arrow leaf, swan potato, wapato, katniss, swamp potato and tule potato.