Learn how to plant, grow, and harvest watermelon with this growing guide from The Old Farmer's Almanac. Mar 8, We have received several questions about seedless watermelon spacing and pollinizer spacing as growers make final decisions for The spacing of standard, seeded watermelon varieties varies somewhat, depending on the varieties used and location. For varieties that produce larger fruit ( Watermelon Farming- By:Michael Mirabella How to grow and harvest Watermelon. of compost added. Often grown in widely spaced enriched hills, or in well-aged compost heaps that include some soil. Give watermelon vines plenty of room to roam, which usually means spacing plants 3 to 5 feet apart. After planting, cover seedlings with floating row covers to . Watermelon, honeydew and cantaloupe are common melons grown in home gardens. Understanding the spacing needs of the melon variety you choose is .