Impact of Introduction: Watercress may be a noxious weed or invasive. 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. Extracts can attract schistosomiasis host Biomphalaria glabrata (snail).
Watercress is an edible green with a peppery flavor that is commonly used in salads, as a garnish, or cooked, and which contains significant amounts of iron, calcium and folic acid, in addition to vitamins A and C. Many benefits from eating watercress are claimed, such as that it acts as a mild stimulant, a source of phytochemicals and antioxidants, a diuretic, an expectorant, and a digestive aid. It may also have cancer-suppressing properties, and is widely believed to help defend against lung cancer.
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This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.