Watercress

Watercress is generally traced to Europe and western Asia, where its wild ancestors occupied cool springs, shallow streams, and other places supplied by clean, moving water. Because people have eaten, transported, and cultivated it for centuries, its original boundaries are difficult to reconstruct precisely. It is now naturalized far beyond Eurasia and can behave as an invasive plant in some waterways.

Ancient Greek and Roman writers knew watercress as a food and medicinal herb. Its sharp taste comes from glucosinolates, sulfur-containing compounds characteristic of the mustard family. The plant’s scientific name, Nasturtium officinale, should not be confused with the colorful garden nasturtiums of the genus Tropaeolum, which belong to a different botanical family.

Organized commercial cultivation expanded in Europe, especially in Britain and France, as growers developed beds fed by clear spring water. The crop’s delicate stems could be gathered in bunches and sent quickly to urban markets. Improved rail transport helped make fresh watercress a familiar food in British cities during the nineteenth century.

Today watercress is grown in managed aquatic beds in Europe and in parts of the United States, including California, Florida, and Hawaii. Commercial production emphasizes controlled water quality because plants gathered from unmanaged waterways may be exposed to microbes, pollutants, or parasites. Its modern reputation rests on the same qualities that first attracted foragers: tender leaves, a crisp texture, and a clean peppery bite.