This North-American species of Arrowhead produces rather variable, narrow to broad-wedge-shaped leaves with veines that meet at the base. The white flowers are male (with yellow stamens) or female, but grow on the same plant. It can extend itself into big groups by its thin roots. On these roots edible tubers are formed (white flesh, purple skin) which taste like patatoes or chest nuts and are cooked and eaten likewise. The fruits of this decorative plant are eaten too. Plant ab. 10 exx. per m2 in good pond-earth and put them in a sunny place in quiet, shallow water. Good winter-hardy.