Common watercress (Nasturtium officinale) is an invasive plant. It was first detected in United States in 1831.
Water cressis a fast-growing, aquatic or semi-aquatic, perennial herb. In arid regions of western states, it can alter function and block streams. It was reported to block water flow in springs in South Central Wisconsin.
For more information about this plant pest, see the CABI data sheet.