Melon These are some of the most heat loving plants that there are. Choose a full sun location, and prepare your soil for transplanting by loosening the soil in a 24” circle and mixing in one bucketful of compost, 6 cups of landscape mix and 6 cups of worm castings. Plant melons in groups, or hills, that have between 2-4 plants in them. After the initial feeding, no more fertilizing will be necessary for your melons. Watering should be done deeply and slowly and the top two inches of soil should be allowed to dry out between waterings. Melons are ready to harvest when they fall off of the vines with only a slight tug. The best months to transplant melons into your garden are late-April through mid-August.