Watermelons grow on vines with large crinkled leaves Growing watermelons requires lots of space, lots of sun, lots of water and lots of nutrients. This video provides instructions for planting and caring for watermelons. Choose the variety of watermelon you want to grow. These fruits come in sizes ranging from 3 pounds to over 70 pounds, and with either red, orange, or yellow flesh. Jubilee, Charleston Grey, and Congo are large cylindrical varieties, while Sugar Baby and Ice Box are two smaller, globe shaped types. Choose a planting location. Watermelon plants need a minimum of 6 hours of sun every day. They produce large vines that spread and take up a lot of space plan on allotting a 4 by 6 foot plot for each plant, unless you’re planting a mini-watermelon variety. soil. Watermelons like loamy, fertile, well-drained soil. To further enrich the soil, till compost into the top of layers. Watermelons grow best in soil with a pH of 6.0 to 6.8. Test the pH of your soil and determine whether the levels are appropriate for watermelon plants. Create mounds. form mounds of earth to plant seeds in. Space these 60cm to 1.8m apart, depending on the amount of space you have. Plant the seeds. Form a flat, slightly concave surface on the top of the hill, then poke three or four holes in the soil with a tool or your finger, about 1 inch deep. Place one to four seeds in each hole, then rake the dirt flat over the top of the seeds. Watch for sprouts to appear. The seeds should germinate and plants will emerge in about 7-10 days, depending on the soil temperature and the depth they are covered when planted. Keep the soil moist around the seeds during the germination period. you should water at least once daily. Mulch each hill with a suitable material after the plants have reached a height of about 4 inches. You can choose pine straw, lawn fabric, or compost. Try to apply the mulch as close to the plants as possible to help prevent weeds, to retain moisture, and to keep the soil from being overheated from direct sunlight around the shallow, new roots. Water less when the flowers bloom. After the flowers bloom, water approximately every 3 days if dry. However, don’t over-water, as watermelons have a low water requirement. Weed regularly. Be sure to weed around the base, along and ahead of the vines. Make sure they’re ready. Under perfect conditions, watermelons will mature to full sweetness in about four months of warm weather. To test the ripeness of a watermelon, check the underside it is ready when it has turned from white to pale yellow.