Watermelon

Prepare planting hills or mounds of rich, well-drained soil amended with generous amounts of aged compost or well-rotted manure. Watermelons are heavy feeders that demand warm soil and a long growing season of 80 to 100 frost-free days. In cooler regions, start seeds indoors three to four weeks before the last frost in biodegradable pots to avoid disturbing roots during transplanting.

Plant seeds or transplants in hills spaced six to eight feet apart, with two to three plants per hill. Lay black plastic mulch before planting to warm the soil and suppress weeds, or use row covers to create a warmer microclimate in the early weeks. Remove row covers once flowers appear to allow pollinator access, as watermelons depend on bee pollination for fruit set.

Water deeply and consistently during vine growth and fruit development, providing one to two inches per week. Reduce watering significantly as fruits approach full size and ripeness to concentrate sugars. Side-dress with a phosphorus-rich fertilizer when vines begin to run, and again when fruit is golf-ball-sized. Place developing fruits on cardboard or straw to prevent ground rot and provide even ripening on the underside.

Watermelon (Citrullus lanatus) traces its origins to the Kalahari Desert region of southern Africa, where wild ancestors still grow today. These wild predecessors bore small, hard, bitter fruit that served primarily as a portable water source for indigenous peoples and wildlife traversing the arid landscape. Archaeological evidence from Libya dates watermelon seeds to approximately 5,000 years ago, while Egyptian tomb paintings from nearly 4,000 years ago depict oblong watermelons being offered at feasts. The ancient Egyptians were among the first to cultivate watermelon systematically, selecting for larger size, sweeter flesh, and red coloration over generations. From Egypt, watermelon cultivation spread along Mediterranean trade routes to Greece and Rome, where it was mentioned by Pliny the Elder in his Natural History. Arab traders carried watermelon seeds eastward to India and China by the 10th century, and China has since become the world's largest producer by a wide margin. The Moorish invasion of the Iberian Peninsula introduced watermelon to Europe in the 13th century, and Spanish colonists subsequently brought seeds to the Americas in the 16th century. Enslaved Africans also brought watermelon knowledge and seeds to the New World, contributing significantly to its cultivation throughout the southern United States. Over the centuries, selective breeding transformed the small, pale, thick-rinded ancestral fruit into the large, thin-rinded, brilliantly red-fleshed melons we enjoy today. Modern breeding has produced seedless triploid varieties, personal-sized icebox types, and cultivars with yellow, orange, and even white flesh. Today, watermelon is grown commercially on every inhabited continent and remains one of the world's most popular summer fruits, with global production exceeding 100 million tonnes annually.

Watermelons thrive in sandy loam soil with a pH of 6.0 to 6.8, rich in organic matter and warmed to at least 70 degrees Fahrenheit before planting. Amend with generous amounts of compost and aged manure before planting. Apply a balanced fertilizer at planting, then switch to a low-nitrogen, high-phosphorus and potassium formula when vines begin to flower. Over-fertilizing with nitrogen produces lush vines but poor fruit set and bland flavor.

Determining watermelon ripeness requires checking multiple indicators simultaneously. The tendril nearest the fruit should be completely brown and dried. The ground spot where the melon rests on the soil should have changed from white to creamy yellow. Thumping the melon should produce a deep, hollow sound rather than a high-pitched ping. The rind surface transitions from glossy to dull when ripe. Cut the stem with a sharp knife rather than twisting or pulling to avoid vine damage.

Store whole uncut watermelons at room temperature for up to two weeks. Once cut, wrap tightly and refrigerate for up to five days. Watermelon can be cubed and frozen for smoothies and frozen treats, though the texture changes upon thawing. The rind can be pickled as a traditional Southern preserve. Watermelon juice is refreshing on its own or can be reduced into a syrup. Dehydrated watermelon chips make a unique concentrated snack.

Watermelon is best enjoyed fresh, chilled, and sliced on hot summer days. It pairs surprisingly well with feta cheese, mint, basil, and lime. Watermelon agua fresca and granita are refreshing beverages and desserts. The fruit is rich in lycopene, vitamin C, and citrulline. Grilled watermelon steaks make an unexpected savory dish, and the rind can be pickled or stir-fried in Asian cuisines.