Dip a paper towel into the cup of water. Remove the paper towel from the water and pour two-thirds of the water out of the cup.
Put the paper towel back into the cup of water and pour watercress seeds onto the paper towel. Keep the paper towel moist for 10 days on a sunny windowsill.
Transplant the seedlings into individual peat pots. Place the pots on a sunny windowsill and keep them moist for three weeks. Carefully transplant the watercress 6 inches apart on the ground in a sunny spot.
Purchase cut watercress at your local super market or farmer's market.
Fill a bucket with water and place the cuttings into the bucket.
Position the bucket in a sunny spot.
Change the water daily.
Cut the watercress back to 4 inches when you notice runners shooting out from the mother plant. You can also perform this action late in the spring.