You carefully sow seeds into perfectly moistened soil. You check them seven times a day until the first green sprout arches its way above the soil. Ooh, the excitement as tiny green leaves unfurl and seedlings grow taller. Then, suddenly, disaster! The bushels of tomatoes and bouquets of flowers dancing in your head have been wiped out in an instant by The Dreaded Damping-Off. What is it, and how can you prevent it?