Sowing & Growing

Watermelon is an annual plant with an optimal temperature range of 20 – 25°C for successful germination, which takes approximately 5 to 10 days, leading to maturity in 60-90 days. It thrives best in a full sun, sheltered location. To prepare the soil, it is recommended to dig and incorporate ample amounts of well-rotted compost or farmyard manure over the winter. Watermelons flourish in sunny and warm environments.

Sow the seeds in pots containing free-draining seed-sowing mix, with a depth of 1cm (½in), during the months of April to May. Place these pots in a propagator, airing cupboard, or similar location, maintaining a temperature range of around 20-25°C until germination occurs, typically within 5-10 days. Once the first true leaves emerge, transplant the seedlings into 13cm (5in) pots for further growth.

When ready for planting out, space the seedlings 24 inches apart after a careful hardening-off period, ensuring that all risks of frost have passed. Opt for a warm and sheltered position, preferably in full sun. Alternatively, for a more dependable crop, consider cultivating watermelons under glass.

Proper care involves regular watering and feeding with liquid fertilizer every 14 days. Pinch out the growing point at the 4-leaf stage and train the laterals (side-shoots) along the row. Hand pollination may be necessary at this stage.

Come harvest time, tapping the watermelon with your knuckles is a reliable method for determining ripeness. A hollow sound indicates that the watermelon is ripe and ready for picking.