Many Amish (not all) plant by the lunar calendar. Waxing moon: corn, tomatoes, beans (grow up). Waning: carrots, beets, potatoes (grow down). New and full moon: plant nothing.
Science
Research shows: moon's influence on plant growth is minimal. But. Lunar cycle = 29 days. A convenient timer for planning. Amish who plant 'by the moon' plant on schedule. Those who don't — plant whenever. Schedule > randomness. Moon = discipline.