It’s so full of nutrients that it tops the US Centers for Disease Control and Prevention’s list of powerhouse vegetables. But this superfood is also surprisingly versatile Watercress is among the oldest known plants consumed by humans, and claims for its medicinal powers are almost as ancient. Hippocrates grew it near his hospital for medicinal purposes; Pliny the Elder favoured it as a remedy for anxiety and coughs. At one time or another its peppery leaves have been used as old folk remedies t