This is the "peppergrass" of 19th century America, botanically unrelated to either upland cress or watercress. Cress is easy to grow and adds a high note to just about any salad. Sow seed 1/4" deep in rich soil as early in spring as the ground can be worked, either in rows 6-8" apart or by broadcast. Keep well watered; harvest when the leaves are 4-6" tall. For continuous crops, sow often and provide shade in hot weather.