Watermelons are nearly synonymous with summer, and this variety is exceptional on a hot day! Like all watermelon plants, Black Diamond loves heat, sun, and plenty of water. Unlike some varieties, though, this emerald green giant produces monstrous fruits that have been known to grow over 50 pounds! The average Black Diamond watermelon may be more in the 30-pound range, which is still a lot of tasty, juicy red fruit. For a refreshing and light summer meal, make a gazpacho using homegrown watermelon, tomatoes, cucumbers and mint.