Taller than the other varieties, this Pickerel plant has rich olive green lance shaped leaves enhanced by blue poker heads of flowers. A favourite pond plant that can be planted up to 40 cm deep, making it a useful marginal to plant in deeper areas where other marginals may not thrive. The pretty blue flowers are attractive to pollinating insects. Plant in a medium or large container using aquatic soil covered with pea gravel. Trim decaying foliage in autumn.