Watermelons Watermelon is an ideal health food because it doesn't contain any fat or cholesterol, is high in fiber and vitamins A & C and is a good source of potassium. Watermelons grow on a vine and must be replanted yearly. The outside of the watermelon is the rind. Inside the watermelon you'll find the flesh and seeds. The seeds can also be roasted and eaten. Some people use the watermelon rind for making preserves, pickles, or relish. That makes the whole watermelon edible! Fresh watermelon may be eaten in a variety of ways and is also often used to flavor summer drinks and smoothies. Watermelon is 92 percent water by weight, the highest percentage of any fruit.