- This peppery green plant, grown all over the world, gets its tingly quality from a key constituent: mustard oil. Long a favorite in salads and sandwiches, watercress also has health qualities. – Potential Health Aids – Commission E endorses watercress – specifically, the fresh or dried leaves and stems – to loosen phlegm and support swelling of the respiratory tract. Watercress compresses may be used in Italy to help support symptoms of stiffness, and homeopaths recommend their customary minut
