Grow in a stream, pond, or bog. If that is unavailable, grow in the shade in an area that is very rich and can be kept constantly wet. Watercress may also be grown in tanks or tubs by placing a few inches of rich soil in the bottom, setting the plants in the soil, and filling the tank with water to the tips of the shoots. Keep the water running constantly, or change it at least once a week. Watercress prefers cold water
Watercress is an aquatic plant with thin, divided leaves and terminal tufts of 4-petaled flowers. It has a pungent flavor and odor. Cut shoots at any time for use in salads, sandwiches, soups, and many other dishes