Watercress is an aquatic plant species with the botanical name Nasturtium officinale.
Watercress is a rapidly growing, aquatic or semi-aquatic, perennial plant native to Europe and Asia, and one of the oldest known leaf vegetables consumed by humans. It is currently a member of the family Brassocaceae botanically related to garden cress, mustard, radish and wasabi.
The hollow stems of watercress are floating, and the leaves are pinnately compound. Small, white and green flowers are produced in clusters and are frequently visited by insects, especially hoverflies such as eristalis flies.