Sow melon seed 1 inch deep. Space seeds 18 inches apart in the garden. Plant melons on raised mounds or hills that are 24 inches across or wider. Mounds warm quickly in spring and stay warm through the growing season. Sow 4 to 6 melons seeds on each mound; when seedlings have developed three or four true leaves, thin to the 2 or 3 strongest seedlings on each hill. Cut the thinned seedlings at soil level with scissors so as not to disturb the roots of the remaining plants. Space mounds 4 to 6 feet apart.