A delightful British native water plant, watercress has bright green leaves and white flowers. This pretty rafting plant with hollow stems creates a floating mat on the pond, giving cover for fish and good habitat for many kinds of pond creatures. Plant in full or part sun. Height to 15 to 30 cm. Plant in zone 2. Good for waterfalls and filters. An excellent plant for water filtration, watercress absorbs toxins improving water quality in the pond. Easily cut back. Propagate by division in spring.