Mary Ellen (Mel) Harte, , Bugwood.org
Common watercress
Nasturtium officinale

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.
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