How to Grow Tomatoes UK

Tomatoes are the UK's most popular home-grown vegetable — rewarding in containers, raised beds, or greenhouses when given warmth, consistent water, and the right support.

Not sure when to sow? See our When to Plant Tomatoes UK →

Watch: How to Grow Tomatoes in the UK

Tomato Growing Calendar

Task	Timing	Notes
Sow indoors	Late March – April	Sow in modules or small pots at 18–21°C
Prick out seedlings	April – May	Move to 9cm pots once first true leaves appear
Harden off	May	Acclimatise over 7–10 days before planting out
Plant outdoors	Late May – June	After last frost; soil 10°C+
Plant in greenhouse	Late April – May	Unheated: mid-May; heated: late April
Begin feeding	June onwards	High-potassium tomato feed once first fruits set
Harvest	July – October	Pick when fully coloured and slightly soft to touch

Sowing Tomatoes

Sow tomato seeds indoors from late March to April, 6–8 weeks before the last expected frost. Sow 1cm deep in seed compost using a dibber or seed tray, two seeds per module, thinning to the strongest. Keep at 18–21°C — a heated propagator speeds germination to 7–10 days. Once seedlings show their first true leaves, prick out into 9cm pots and grow on in a bright, warm spot.

Do not sow too early — tomatoes sown in February without supplementary lighting become leggy and weak. Late March is the sweet spot for most UK growers.

Growing Conditions

Soil

Tomatoes need rich, well-draining soil with a pH of 6.0–6.8. Dig in plenty of well-rotted compost or manure before planting. In containers, use a quality multipurpose compost with added perlite for drainage and slow-release fertiliser granules.

Position

Full sun is essential — at least 6–8 hours per day. A south-facing wall or greenhouse provides the warmth tomatoes need to ripen well in the UK. Outdoor crops do best in sheltered spots protected from wind.

Watering

Water deeply and consistently — 2–3 times per week outdoors, daily for containers in hot weather. Always water at the base; wet foliage encourages blight. Inconsistent watering causes blossom end rot and fruit splitting. Mulch around plants to retain moisture.

Best Varieties

Gardener's Delight

Classic cherry tomato with outstanding sweet flavour. Reliable outdoors or under glass. RHS Award of Garden Merit.

Moneymaker

Traditional UK favourite. Medium-sized, smooth red fruits. Reliable cropper in greenhouses and outdoors in sheltered spots.

Ferline F1

Excellent blight resistance — ideal for outdoor growing in wetter UK regions. Good-sized fruits with solid flavour.

Tumbling Tom

Trailing bush variety perfect for hanging baskets and containers. Cherry-sized fruits, no staking needed.

Regional Timing

Region	Sow Indoors	Plant Out
South England	Late March	Late May
Midlands / Wales	Early April	Early June
North England	Mid-April	Mid-June
Scotland	Late April	Greenhouse only recommended; late June outdoors

What You'll Need to Grow Tomatoes Successfully

A sturdy trowel and a good pair of secateurs are the two tools you'll reach for most — from transplanting seedlings to keeping cordon varieties neatly pruned all season. Pair these with a quality peat-free compost and a slow-release fertiliser for containers, and you'll have everything needed for a productive crop.

Browse our Hand Tools for Gardening for trowels, dibbers, and secateurs, and our Soil & Plant Care collection for composts and feeds.

Top 3 Mistakes to Avoid

Sowing too early without heat. Seeds sown in January or February without a heated propagator and grow lights produce weak, leggy seedlings that never fully recover. Wait until late March.
Inconsistent watering. Irregular moisture is the primary cause of blossom end rot and fruit splitting. Keep soil evenly moist throughout the season and mulch to help.
Neglecting to remove side shoots on cordon varieties. Unpruned cordons become unmanageable and divert energy away from fruit. Remove side shoots weekly throughout summer using a sharp pruning knife or secateurs.

Companion Planting

Basil — classic companion; said to repel aphids and whitefly, and improves flavour
Marigolds (Tagetes) — deter whitefly and attract beneficial insects; plant around the base
Borage — attracts pollinators and repels tomato hornworm
Avoid fennel — allelopathic; inhibits tomato growth
Avoid brassicas — compete for nutrients and can harbour shared pests

Main Pest & Disease Risk

Blight (Phytophthora infestans) is the most serious threat to UK tomatoes — brown patches spread rapidly in warm, wet weather. Choose blight-resistant varieties (Ferline, Crimson Crush), ensure good air circulation, and avoid overhead watering. Aphids cluster on new growth — blast off with water or use insecticidal soap. Whitefly is common under glass — use yellow sticky traps or introduce Encarsia formosa as a biological control. Blossom end rot is a calcium uptake disorder caused by irregular watering — not a pest, but very common.

🌱 Did You Know?

Tomatoes are technically a fruit — a berry, in botanical terms. The UK Supreme Court has never had to rule on this, but the EU famously classified them as a vegetable for trade tariff purposes in 2001. Either way, they're the most widely grown "vegetable" in British home gardens.

Frequently Asked Questions

When should I sow tomato seeds in the UK?

Sow tomato seeds indoors from late March to early April, 6–8 weeks before the last expected frost. Sowing earlier without supplementary lighting and heat leads to weak, leggy seedlings. Most UK gardeners aim for late March as the ideal start date.

Can I grow tomatoes outdoors in the UK?

Yes — bush and cordon varieties can be grown outdoors in sheltered, sunny spots from late May onwards. Choose blight-resistant varieties such as Ferline or Crimson Crush for outdoor growing, especially in wetter regions. Greenhouses give more reliable results in northern areas.

Why are my tomato leaves curling?

Leaf curl in tomatoes is most commonly caused by heat stress, inconsistent watering, or over-pruning. It can also indicate viral infection or broad mite damage. Check watering consistency first — this resolves the majority of cases. If leaves are mottled or distorted, suspect a virus and remove affected plants.

How do I prevent tomato blight?

Choose blight-resistant varieties (Ferline, Crimson Crush, Fantasio), ensure good air circulation by spacing plants correctly and removing lower leaves, avoid overhead watering, and monitor forecasts — blight spreads rapidly in warm, wet conditions (the "Smith Period"). Remove and bin (do not compost) any affected material immediately.

When are tomatoes ready to harvest in the UK?

Most UK tomatoes are ready to harvest from July through to October, depending on variety and growing method. Greenhouse crops ripen earlier. Pick when fully coloured and slightly soft to the touch. Before the first frost, harvest all remaining green tomatoes — they will ripen on a sunny windowsill.

Do I need special tools to prune tomato side shoots?

You don't need specialist equipment, but a sharp, clean tool makes a real difference. A small pruning knife or a pair of bypass secateurs gives a clean cut that heals quickly and reduces disease risk. Avoid tearing shoots off by hand on mature plants — this can damage the stem. Browse our Hand Tools for Gardening for suitable pruning knives and secateurs.