Growing Watermelon
Warm-season UK guidance for sowing watermelon seeds and growing under glass or in a hot summer.
Overview
Watermelons need heat and a long season. In the UK, greenhouse or polytunnel culture is more reliable than open ground. Compact types are easier in limited space than giant-fruited types.
Sowing
Sow indoors in spring in individual pots. Keep warm until plants are sturdy, then move to a heated or unheated greenhouse as conditions allow. Outdoor planting is only for warm regions after frost risk.
Growing on
Give plants rich, well-drained soil or large containers, full sun, and regular water once established. Allow room for vines to trail or train them where space is limited.
Frequently asked questions
Can watermelons ripen outdoors in the UK?
Sometimes in a hot summer in a sheltered sunny site, but a greenhouse or polytunnel greatly improves the chance of ripe fruit.
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