The watermelon is a desert survival fruit. It evolved to store water in arid environments, and humans have relied on that trait for thousands of years.
African origins
Wild watermelons still grow across the Kalahari Desert in southern Africa. They’re small, hard, and bitter, nothing like the sweet red fruit we know. But they hold water, and in a desert, that matters more than taste.
The oldest evidence of watermelon cultivation comes from Libya, where 5,000-year-old seeds have been found at archaeological sites. Watermelon seeds were placed in the tomb of Pharaoh Tutankhamun. Ancient Egyptians grew them not just for eating but as portable water containers for long journeys.
David Livingstone described wild watermelons covering the ground “like pumpkins in a field” during his explorations of southern Africa. They were a critical water source for both humans and animals.
A complicated journey
Watermelons spread from Africa to the Mediterranean, then to India and China (which now produces more watermelon than any other country). The Moors brought them to Spain. European colonists and enslaved Africans both brought watermelons to the Americas.
After the Civil War, watermelon became entangled with racist caricatures in the U.S. Free Black people grew and sold watermelons as a source of income, and white supremacists weaponized the fruit as a symbol of laziness and simplicity. These stereotypes were deliberately constructed and widely distributed through popular culture. Understanding this history matters because the stereotypes persist, and they were never about the fruit.
Watermelon’s cultural meaning varies enormously by context. In China, it’s a standard summer gift and a symbol of good fortune. In Middle Eastern countries, it’s served with feta cheese as a staple combination. In the American South, it’s a beloved part of summer cookouts for people of all backgrounds.
The science inside
A watermelon is 92% water and 6% sugar. The red color comes from lycopene, the same antioxidant that colors tomatoes. Yellow and orange watermelons have less lycopene and more beta-carotene.
Seedless watermelons aren’t genetically modified. They’re triploid hybrids, created by crossing a normal diploid watermelon with a tetraploid one (whose chromosomes were doubled using colchicine, a chemical derived from autumn crocus). The resulting triploid plant has an odd number of chromosome sets and can’t produce viable seeds. It still needs to be pollinated to fruit, which is why farmers plant seeded “pollinizer” varieties alongside seedless ones.
The white rind between the green skin and red flesh is edible and nutritious. It contains citrulline, an amino acid that the body converts to arginine.
Competitive melons and square fruit
Competition growers in the U.S. produce watermelons exceeding 300 pounds. The current world record is over 350 pounds. These melons take months of careful feeding and often aren’t very sweet.
In Japan, farmers grow square watermelons by placing young melons inside glass or plastic boxes. The fruit grows to fill the container. Square watermelons are primarily decorative and sell for $100 or more. They’re harvested before fully ripe to maintain the shape, so they don’t taste as good as round ones.
Heart-shaped, pyramid-shaped, and even human-face-shaped watermelons also exist, all grown using molds.