Needs plenty of sun with warm, well-draining soil. The key is plenty of moisture, they need sunlight, and heat. Melons demand two to three months of heat. Don’t plant until the ground temperature is above 70 degrees. Melons need room to roam. Space plants 36 to 42 inches apart. Or, to save space, plant melons 12 inches apart at the base of a trellis. When trellising melons, tie vines to the trellis daily, using soft plant ties that won’t crush stems. A trellis for cantaloupe should be large: up to 8 feet tall and 20 feet wide in warmest climates. Wire fencing works well.