MELONS - The best cantaloupes are those allowed to ripen on the vine and picked when fruits slip away from stem by slightly turning the fruit. Charantais type cantaloupes are the exception and are best harvested before full slip for fullest flavor. Cantaloupes grow and produce best in soil rich in organic matter and with soil temperatures consistently between 70° to 80°. f set out too early plants will be stunted and yields cut dramatically. Approximately 1200 seed per ounce or 20-40 seeds per gram.