Growing Tomatoes from Seed
UK guidance for sowing tomato seeds indoors and growing on for greenhouse or outdoor cropping.
Overview
Tomatoes are a staple UK greenhouse crop and can also succeed outdoors in a warm summer if plants are hardened off and sheltered. Start seeds indoors in spring, then grow on with strong light and consistent watering.
Sowing
Sow indoors in early to mid-spring. Use seed compost, sow thinly, cover lightly, and keep warm and moist. Transplant into individual pots once seedlings are sturdy with true leaves.
Growing on
Provide bright light and support stems as plants grow. Water regularly at the base; irregular watering can contribute to blossom end problems. Ventilate greenhouses on warm days. Outdoor plants need a sunny, sheltered position after frost risk has passed.
Harvest
Pick fruits when they colour and soften slightly for the type. Remove ripe fruit regularly to encourage further cropping.
Frequently asked questions
When should I sow tomato seeds in the UK?
Sow indoors in early to mid-spring so plants are ready to move to a greenhouse or outdoors after frost risk has passed.
Can I grow tomatoes in pots?
Yes. Use a large pot with drainage, a quality potting compost, and a sunny, sheltered position. Water consistently as pots dry out faster than beds.
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