This hardy form of arrowhead originates in North America. The leaves are broadly arrow shaped and flowers are clear white with yellow centres. Can be planted up to 60 cm deep. A useful marginal to plant in deeper areas where other marginals may not thrive. Tall, emergent plants are useful to pond insects such as emerging dragonflies. Plant in a medium or large container using aquatic soil covered with pea gravel. Trim decaying foliage in autumn.