Could you provide details on soil, type of plant food, etc. for growing a good watermelon for Zone 7?
Certified GKH Gardening Expert
Here is an article that you may find helpful: https://www.gardeningknowhow.com/edible/fruits/watermelon/growing-watermelon.htm
Watermelons can grow in many kinds of soil, but prefer a light, sandy, fertile loam that is well-drained. Add generous amounts of manure, compost, or other organic matter to enrich the soil as well.