People have recognised the health benefits of watercress for centuries. Although the story that Hippocrates set up his first hospital by a spring in 400BC so armfuls could be grown to feed patients is probably false, it’s taken modern medicine a little while to catch up to the benefits of watercress. Eaten raw it releases mustard oils which cause it’s peppiness. These oils, similar to brassicas are antioxidant and may slow the growth of certain cancers. It is also high in vitamin C and other vitamins and minerals.