To grow watermelons successfully, ensure to plant them in warm, sunny locations with well-drained, fertile soil enriched with compost or organic matter. The soil temperature should be at least 65°F (18°C) for seed germination. Plant watermelon seeds about 1 inch (2.5 cm) deep or use transplants started indoors in colder regions. Space plants about 3 to 5 feet apart in rows spaced 6 to 8 feet apart to allow enough room for growth, given watermelon vines can spread widely. Watermelons require consistent deep watering, especially during fruit development, but avoid wetting the foliage to prevent disease. Fertilize regularly with balanced nutrients, favoring phosphorus and potassium once plants flower, and mulch around plants to retain moisture and reduce weed competition. Watermelon plants have male and female flowers and require pollination to produce fruit. Harvest when the melon rind changes from bright to dull green and the tendril near the stem dries up, indicating ripeness. Major steps in watermelon growing include soil preparation with compost or aged manure, waiting for warm soil, proper spacing, regular watering and feeding, mulching, and timely harvesting for best fruit quality.