Watermelon Seeds

Few summer fruits say "Egyptian summer" like a chilled slice of watermelon. These Watermelon Seeds give you the classic sprawling vine that thrives in heat and full sun, producing large, refreshingly sweet melons with crisp, juicy flesh that is perfect for fresh eating, cold dessert platters and summer juices. It is a heat-loving, frost-tender fruit, so it rewards a hot, bright corner of the garden with one of the most satisfying harvests of the season.

Planting

Watermelon is a warm-season crop and very sensitive to frost, so timing is everything. Direct-seed one to two weeks after the last frost once the soil is genuinely warm (above about 21 C / 70 F), or start transplants indoors roughly 4-5 weeks before setting them out. Only transplant after all frost danger has passed and the soil has reached 18-21 C (65-70 F). Sow seed about 1.3-2.5 cm deep, using around 2.5 cm when direct-seeding into hills. For germination, aim for a soil temperature of at least 16-18 C at 10 cm depth, with the optimum range being 21-32 C; at about 25 C seedlings emerge in roughly 5 days, while germination is very slow below 21 C. Give the vines room: space rows about 1.8-2.4 m apart and plants about 0.9-1.8 m apart in the row, allowing roughly 2.2 m² per plant. If planting in hills, sow 4-5 seeds per hill with hills 1.8-2.4 m apart. Watermelons resent root disturbance, so start any transplants in cells or pots and set them out while small with the rootball intact, watering them in with a gentle starter or fish-emulsion solution that will not burn tender roots. About a week after germination, thin direct-seeded hills to two strong plants per hill.

Fertilizing

Start with a complete fertilizer worked in before planting, such as 5-10-10 at about 1.5 kg per 100 m², or 10-10-10 / 13-13-13 at about 1.5 kg per 10 m². Side-dress with nitrogen before the vines start to run, for example 34-0-0 or calcium nitrate (15.5-0-0), then give a second feed after bloom when the fruit is developing. Go easy on nitrogen overall, since an excess delays fruiting and can cause hollow heart in the melons.

Care

Choose a hot, sunny location and give the plants full sun, ideally around 8-10 hours of direct sunlight per day. Keep the soil uniformly moist but never saturated, watering deeply and infrequently at about 2.5-5 cm per week, ideally with drip or a soaker hose. Good moisture matters most early on and during flowering and fruit set; in the final week before the fruit ripens, reduce or stop watering, because overwatering dilutes the flavour. Watch for pests such as cucumber beetles (striped and spotted), squash bugs, aphids, spider mites, thrips, and caterpillars like rind/pickle worms and cutworms; cucumber beetles are most damaging at the seedling stage and also spread disease, so use floating row covers (removed at flowering so bees can pollinate) or an approved insecticide such as pyrethrin. Common diseases include anthracnose, gummy stem blight, powdery and downy mildew, Fusarium wilt, cucurbit viruses and root-knot nematodes; rotate your beds and avoid planting watermelon or related cucurbits on the same ground for at least 3 years. Harvest when the curly tendril nearest the fruit stem turns brown and dries, the ground spot where the melon rests turns from greenish-white to a creamy yellow, the rind loses its gloss and turns dull, and a flick or thump gives a dull, hollow sound rather than a high ring. This is typically about 35 days from fruit set and roughly 70-90 days from planting, depending on variety.

Growing in Egypt: Egypt's hot summers suit watermelon perfectly; the only real limit is the cool Dec-Feb window when the soil is too cold for good germination. In the Nile Delta and Lower Egypt (Cairo, Alexandria), direct-sow or transplant from mid-February to April once the soil warms past about 18 C and frost risk is gone, for a May-July harvest; transplants can be started indoors in January to gain 4-5 weeks. In Upper Egypt (Minya, Asyut, Luxor, Aswan), where warmth arrives earlier, sowing can begin from late January to March for an April-June harvest before peak summer heat stresses fruit set, and a late-summer crop sown in August can be harvested in October-November in warm areas. Avoid sowing from November to January in the Delta, where the soil is too cool and an occasional frost can kill seedlings.