A member of the Cucurbitaceae family, watermelon grows on vines on the ground like its relatives, the cantaloupe, pumpkin and squash. Watermelon is a warm-season annual native to Africa that is popular around the world. Mini or personal size seedless watermelons typically weigh between 2 and 7 lbs. Also called “palm” melons, these watermelons tend to have a thinner rind and thus more edible flesh. They may be red or yellow inside. Mini watermelons have grown in popularity since 2003, when they became widely available in U.S.