Popular

Tomatoes

Solanum lycopersicum

Whole ripe red tomatoes and one cut in half showing the seeds and flesh
Open the full interactive tomatoes guide →

⚡ Quick start

  • Sow indoors Jan–Mar at 20–22°C in heated propagator
  • Pot on individually when first true leaves appear
  • Harden off outdoors 10–14 days before final planting
  • Plant out after last frost (May–Jun depending on region)
  • Water consistently — daily in heat, deeply at the base
  • Feed with high-potash liquid fertiliser weekly once flowering
  • Remove cordon side shoots every week when under 2–3cm
  • Stop cordon plants in August (4–5 trusses outdoors, 6–8 under glass)
  • Harvest Jul–Oct; bring green fruits indoors to ripen at season end
🌱 SowJan–Mar (indoors)
🌾 HarvestJul–Oct
☀ PositionFull sun
📐 Spacing45–60cm
DifficultyChallenging

⚡ Quick facts

Difficulty
Moderate
Crop type
Tender Annual
Position
Full Sun
Soil
Rich, Moisture Retentive
Container friendly
Yes
Greenhouse recommended
Yes
Outdoor suitable
South UK Best
Frost hardy
No

01 About

The tomato is one of the most widely grown and rewarding crops in the British kitchen garden. Technically a fruit, used as a vegetable in cooking, the range of flavours, colours, sizes, and uses available to the home grower far exceeds anything found in a supermarket. Tomatoes are tender perennials grown as annuals in the UK climate — frost will kill them outright, and they need reliable warmth to grow well and ripen. With the right variety, attentive watering and feeding, they will reward you with harvests from midsummer right through to the first frosts of autumn.

02 What to Grow

A mix of tomato types: red, orange, yellow and dark beefsteaks, plums and cherry tomatoes

Tomatoes come in an extraordinary range of types, and choosing the right one for your growing space and skill level makes the difference between a bumper harvest and a season of frustration. They fall into two growth habits: cordon (indeterminate) varieties that grow tall and need regular side-shooting and support, and bush (determinate) varieties that are more compact and require little or no training. Within those habits, there are seven distinct families — each with different fruit sizes, flavours, and ideal uses.

03 Varieties

The number of varieties shown for each crop is based on UK consumption data (2025/26) — the more popular the crop, the more variety choices we include.

🍒 Cherry Tomatoes

Small, sweet, and prolific. The easiest to ripen outdoors in the UK.

Gardener's Delight tomato (for outdoors, for containers, top flavour, good for beginners): a truss of glossy round red cherry tomatoes

Gardener's Delight

Cherry · Cordon

The most popular UK garden tomato. Prolific, reliable, and sweet. Performs well outdoors and under glass.

  • Outdoor
  • Container
  • ⭐ Flavour
  • Beginners
Sungold tomato (F1 hybrid, for the greenhouse, top flavour): a truss of bright orange cherry tomatoes

Sungold

Cherry · Cordon

Orange fruits with outstanding sweetness. Crops prolifically under glass. One of the most praised UK varieties.

  • AGM
  • F1
  • Greenhouse
  • ⭐ Flavour
Black Cherry tomato (Heritage, for the greenhouse, top flavour): a leafy truss of dark mahogany cherry tomatoes

Black Cherry

Cherry · Cordon

Deep mahogany fruits with a rich, complex flavour. Striking on the vine and in the kitchen. Best under glass.

  • Greenhouse
  • Heritage
  • ⭐ Flavour
Sweet Million tomato (F1 hybrid, for the greenhouse, for containers): a long truss packed with small bright red cherry tomatoes

Sweet Million

Cherry · Cordon

Exceptionally long trusses of small, bright red fruits. Very high yields with good crack resistance.

  • AGM
  • F1
  • Greenhouse
  • Container
Yellow Pear tomato (Heritage, for outdoors, for containers): golden-yellow pear-shaped cherry tomatoes on the vine

Yellow Pear

Cherry · Cordon

Distinctive pear-shaped fruits in golden yellow. Sweet, mild flavour and eye-catching in salads. Prolific and easy to grow.

  • Outdoors
  • Container
  • Heritage
Rosella tomato (Heritage, for the greenhouse, top flavour): a truss of rose-pink cherry tomatoes

Rosella

Cherry · Cordon

Deep rose-pink cherry fruits with a rich, complex flavour. Striking colour on the vine and outstanding in the kitchen.

  • AGM
  • Greenhouse
  • Heritage
  • ⭐ Flavour
Gartenperle tomato (for hanging baskets, compact, no pinching out needed): a trailing plant dripping with small red cherry tomatoes

Gartenperle

Compact trailing cherry tomato bred for hanging baskets and window boxes. Tiny round deep-red fruits in prolific clusters. No pinching needed — the naturally bushy habit stays neat all season. Outstanding for balconies and small spaces.

  • Hanging Basket
  • Compact
  • No Pinching
Gartenperle tomato (for hanging baskets, compact, no pinching out needed): a trailing plant dripping with small red cherry tomatoes

Ildi

A prolific Italian cherry tomato producing enormous trusses of tiny, oval, pale yellow-gold fruits. Exceptionally sweet and mild. One of the most productive cherry tomatoes available — a single truss can carry 50+ fruits. Outstanding for greenhouse growing.

  • AGM
  • Prolific
  • Yellow
  • Sweet
Rosella tomato (Heritage, for the greenhouse, top flavour): a truss of rose-pink cherry tomatoes

Piccolo

A compact-growing cherry tomato producing heavy trusses of small, round, deep-red fruits with excellent rich tomato flavour. Outstanding reliability in UK greenhouses and polytunnels. Very popular with commercial growers for its consistent cropping and long season.

  • Reliable
  • Deep Red
  • Long Season

🍅 Standard Tomatoes

Medium round fruits — the classic tomato. Reliable and versatile, performing well both outdoors and under glass.

Alicante tomato (for outdoors, for the greenhouse, good for beginners): five smooth, round, medium red tomatoes

Alicante

Standard · Cordon

A classic reliable variety with medium-sized, well-flavoured fruits. One of the best performers for UK outdoor conditions.

  • Outdoors
  • Greenhouse
  • Beginners
Shirley tomato (F1 hybrid, for the greenhouse, good for beginners): a truss of round red medium tomatoes

Shirley

Standard · Cordon

Disease-resistant F1 variety. Highly regarded by commercial and amateur growers alike. Consistent heavy yields.

  • AGM
  • F1
  • Greenhouse
  • Beginners
Moneymaker tomato (for the greenhouse, good for beginners): a truss of evenly sized round red tomatoes

Moneymaker

Standard · Cordon

The traditional British greenhouse tomato. Reliable and consistent — a timeless classic for first-time growers.

  • Greenhouse
  • Beginners
Tigerella tomato (Heritage, for outdoors, top flavour): red tomatoes striped with orange on a leafy truss

Tigerella

Standard · Cordon

Orange and red striped fruits with a tangy, complex flavour. One of the most visually striking heritage tomatoes.

  • AGM
  • Outdoors
  • Heritage
  • ⭐ Flavour
Ailsa Craig tomato (Heritage, for outdoors, for the greenhouse, top flavour): a truss of round, glossy red medium tomatoes

Ailsa Craig

Standard · Cordon

Classic Scottish heritage variety. Medium round fruits with thin skin, sweet flavour and excellent yields. A British garden staple.

  • Outdoors
  • Greenhouse
  • Heritage
  • ⭐ Flavour
Harbinger tomato (for outdoors, good for beginners): five round medium red tomatoes

Harbinger

Standard · Cordon

One of the earliest British varieties to ripen. Medium round fruits, reliable outdoors. Ideal for short growing seasons.

  • Outdoors
  • Beginners

🥩 Beefsteak Tomatoes

Large, meaty fruits with fewer but impressive harvests. Require greenhouse warmth in the UK to ripen reliably.

Big Boy tomato (F1 hybrid, for the greenhouse): large, slightly ribbed red beefsteak tomatoes on a leafy truss

Big Boy

Beefsteak · Cordon

Large, smooth, bright red fruits of excellent quality. Requires greenhouse warmth. Fewer but impressive fruits per plant.

  • F1
  • Greenhouse
Brandywine tomato (Heritage, for the greenhouse, top flavour): three large, ribbed pink-red beefsteak tomatoes

Brandywine

Beefsteak · Cordon

Large pink-red fruits with extraordinary flavour widely considered among the finest of all heritage tomatoes.

  • Heritage
  • Greenhouse
  • ⭐ Flavour
Black Krim tomato (Heritage, for the greenhouse, top flavour): a potted plant bearing dark purple-brown tomatoes

Black Krim

Beefsteak · Cordon

Deep purple-brown fruits with a rich, smoky flavour. Unusual and impressive. Originating from the Crimea region.

  • Heritage
  • Greenhouse
  • ⭐ Flavour
Marmande tomato (Heritage, for outdoors, top flavour): one large, deeply ribbed red beefsteak tomato

Marmande

Beefsteak · Cordon

A classic French beefsteak, widely grown in UK gardens. Deeply ribbed and irregular, with outstanding flavour and size. Superb for slicing.

  • AGM
  • Outdoors
  • Heritage
  • ⭐ Flavour
Ox Heart tomato (Heritage, for the greenhouse, top flavour): large pink-red tomatoes, one clearly heart-shaped

Ox Heart

Beefsteak · Cordon

Dramatic heart-shaped fruits with dense meaty flesh and very few seeds. Deep pinkish-red. Outstanding for slicing.

  • Greenhouse
  • Heritage
  • ⭐ Flavour
Gigantomo tomato (F1 hybrid, for the greenhouse): two huge ribbed red tomatoes on a board beside a hand for scale

Gigantomo

Beefsteak · Cordon

One of the largest tomatoes you can grow. Single fruits regularly reach 500–700g. Deep red, smooth skin. Greenhouse recommended.

  • Greenhouse
  • F1

🫙 Plum Tomatoes

Oval, dense, and low in water — the kitchen gardener's choice for sauces, passatas, and preserving.

Roma tomato (for outdoors, for the greenhouse, good for beginners): five red oval plum tomatoes

Roma

Plum · Cordon

The classic paste tomato. Meaty, low in water, perfect for passata, sauces, and drying. Reliable and productive.

  • Outdoors
  • Greenhouse
  • Beginners
San Marzano tomato (Heritage, for the greenhouse, top flavour): long, pointed red plum tomatoes

San Marzano

Plum · Cordon

The Italian culinary classic — elongated, sweet, and intensely flavoured. Best under glass in the UK.

  • Heritage
  • Greenhouse
  • ⭐ Flavour
Principe Borghese tomato (Heritage, for outdoors): a truss of small oval red plum tomatoes

Principe Borghese

Plum · Cordon

Traditional Italian drying tomato with small oval fruits and thin, flavour-rich skin. Ideal for sun-drying and passata.

  • Heritage
  • Outdoors
Opalka tomato (Heritage, for the greenhouse, top flavour): a long red plum tomato beside one cut in half to show the dense flesh

Opalka

Plum · Cordon

Polish heritage variety with exceptionally dense, meaty flesh and minimal seed cavities. One of the finest sauce tomatoes available.

  • Heritage
  • Greenhouse
  • ⭐ Flavour
Amish Paste tomato (Heritage, for outdoors, top flavour): four large, chunky red plum tomatoes

Amish Paste

Plum · Cordon

American heritage plum with large chunky fruits — bigger and meatier than San Marzano. Outstanding for passata and sauces.

  • Outdoors
  • Heritage
  • ⭐ Flavour
Black Plum tomato (Heritage, for the greenhouse, top flavour): dark burgundy-black oval plum tomatoes

Black Plum

Plum · Cordon

Deep burgundy-black oval fruits with rich complex flavour. Striking in appearance and outstanding roasted or in sauces.

  • Greenhouse
  • Heritage
  • ⭐ Flavour

🌿 Bush Varieties

Compact, self-supporting, no side-shooting required. Bred for outdoor UK conditions.

Red Alert tomato (for outdoors, for containers, good for beginners): a compact bush plant covered in small red fruits

Red Alert

Bush

Compact, early-ripening bush variety. One of the best outdoor performers in the UK. Good flavour for a bush type.

  • Outdoors
  • Container
  • Beginners
Outdoor Girl tomato (for outdoors, good for beginners): a bushy plant carrying round red tomatoes

Outdoor Girl

Bush

Bred specifically for UK outdoor conditions. Early and reliable. Medium round fruits with solid flavour.

  • Outdoors
  • Beginners
Tornado tomato (for outdoors, for containers, good for beginners): a bushy plant in a terracotta pot laden with red tomatoes

Tornado

Bush

Compact spreading habit, no staking required. Consistent heavy yields of well-flavoured fruits outdoors.

  • Outdoors
  • Container
  • Beginners
Totem tomato (for outdoors, for containers, good for beginners): five round red tomatoes (fruit only, no plant)

Totem

Bush

Exceptionally compact upright bush, ideal for pots and patios. Tidy, self-supporting and loaded with medium red fruits.

  • Outdoors
  • Container
  • Beginners
Losetto tomato (F1 hybrid, for outdoors, for containers): five round red tomatoes

Losetto

Bush

Compact blight-resistant bush variety. Generous clusters of medium-small red fruits. Reliable outdoors even in wet summers.

  • Outdoors
  • Container
  • F1
Balconi Red tomato (for windowsills, for containers, good for beginners): sprays of small red cherry tomatoes on the stem

Balconi Red

Bush · Dwarf

Ultra-compact dwarf — only 30cm tall. Perfect for windowsills, window boxes and small pots. No staking required.

  • Windowsill
  • Container
  • Beginners

🪴 Trailing & Hanging Basket

Compact trailing types bred specifically for hanging baskets and small containers. No training required.

Tumbling Tom Red tomato (for outdoors, for containers, top flavour): a cluster of red cherry tomatoes on the vine

Tumbling Tom Red

Trailing · Bush

The most popular hanging basket tomato. Red cherry fruits on cascading stems. Excellent flavour.

  • Outdoors
  • Container
  • ⭐ Flavour
Tumbling Tom Yellow tomato (for outdoors, for containers): a leafy truss crowded with golden-yellow cherry tomatoes

Tumbling Tom Yellow

Trailing · Bush

Identical habit to the red version but with golden yellow fruits. Milder flavour. Striking in a basket.

  • Outdoors
  • Container
Maskotka tomato (for outdoors, for containers): a leafy truss crowded with small red cherry tomatoes

Maskotka

Trailing · Bush

Vigorous trailing variety producing masses of small red fruits. Good for baskets and window boxes.

  • Outdoors
  • Container
Hundreds & Thousands tomato (for outdoors, for containers, top flavour, good for beginners): a heap of hundreds of tiny red-orange tomatoes

Hundreds & Thousands

Trailing · Bush

Tiny, intensely sweet fruits in enormous quantities on trailing stems. Perfect for baskets and children's growing.

  • Outdoors
  • Container
  • ⭐ Flavour
  • Beginners
Cherry Falls tomato (for outdoors, for containers, top flavour): a truss of shiny red cherry tomatoes

Cherry Falls

Trailing · Bush

Bred specifically for hanging baskets. Long cascading stems loaded with clusters of small sweet red fruits all season.

  • Outdoors
  • Container
  • ⭐ Flavour
Terenzo tomato (F1 hybrid, for outdoors, for containers): a short truss of glossy red cherry tomatoes

Terenzo

Trailing · Bush

Compact trailing F1 ideal for hanging baskets. Neat habit, generous red cherry fruits, no training required.

  • Outdoors
  • Container
  • F1

🔬 Miniature

Ultra-compact plants for small spaces, windowsills, and growing with children.

Micro Tom tomato (for windowsills, for containers, good for beginners): a small plant in a terracotta pot with red and green fruits

Micro Tom

Miniature

One of the smallest tomato varieties — plants grow to just 15-20cm. Perfect for windowsills and novelty growing.

  • Windowsill
  • Container
  • Beginners
Tiny Tim tomato (for windowsills, for containers, good for beginners): a dwarf plant in a terracotta pot covered in small red fruits

Tiny Tim

Miniature

A reliable dwarf variety growing to just 20cm. Produces masses of tiny red cherry tomatoes. Ideal for pots and windowsills.

  • Windowsill
  • Container
  • Beginners
Minibel tomato (for windowsills, for containers, good for beginners): a compact potted plant with clusters of red and green fruits

Minibel

Miniature

French dwarf variety, compact and bushy with clusters of small sweet fruits. Well suited to window boxes and small pots.

  • Windowsill
  • Container
  • Beginners

04 Where to Source

Packets of cherry, beefsteak and plum tomato seeds beside seedling trays and young plants

Tomato seeds and plants are available through several routes, each with advantages in variety selection, cost, and timing. Knowing where to look — and when — is as important as knowing what to grow.

A hand holding seed packets above a doormat, as if just delivered by post

📬 Seeds by Post

Far wider variety selection than any garden centre. Specialist seed companies online carry hundreds of varieties including heritage and open-pollinated types unavailable in shops. Check each packet for sow date, germination temperature, days to maturity, and outdoor or greenhouse suitability. Order from January — popular varieties sell out early.

A garden-centre display of potted tomato plants, each labelled with its variety

🏪 Garden Centres

Most garden centres stock a solid range of tomato seeds from February, and plug plants or young tomatoes from April. Variety selection is narrower than online but you can inspect quality in person and take advice from staff.

A market stall selling tomato and vegetable seedlings, with chalkboard signs

🛍️ Day Markets & Plant Sales

Local markets, farmers' markets, and community plant sales are an excellent source of locally-grown plug plants in May and June — often at lower prices. Church fetes, school plant sales, and open-garden charity days frequently feature excellent plants.

Two people passing a potted tomato seedling over a garden fence

🤝 Friends, Neighbours & Seed Swaps

Do not overlook the value of a friend's spare plug plant or locally saved seed. Many allotment communities and gardening clubs run annual seed swaps where members trade named varieties, including rare heritage types.

Timing tip: Order seeds in January and February. Popular varieties sell out quickly. Garden centres and markets are a reliable backup from April onwards.

05 Planting Options

🪟 Window Sill

A tomato plant with ripening fruit in a red pot on a sunny windowsill

Growing tomatoes on a windowsill is a practical option for those without outdoor space or a greenhouse, and is well suited to compact bush and tumbling types that trail attractively without needing support. A south-facing window is essential. Use a pot at least 20-25cm in diameter with good drainage. Use peat-free compost with 20-25% perlite. Rotate the pot a quarter turn every day or two to prevent uneven growth. Check compost daily and water when the top centimetre is dry. Begin a high-potash liquid tomato feed every 7-10 days once the first flowers appear.

Suitable varieties: Tumbling Tom Red, Tumbling Tom Yellow, Micro Tom, Red Alert, Maskotka. Cordon varieties are not suitable.

🏠 Greenhouse

Tall cordon tomatoes tied to canes in a greenhouse bed, with ripening trusses

A greenhouse extends the season at both ends and allows varieties that would struggle to ripen outdoors in most of the UK. It is the gold standard for growing tomatoes in Britain, delivering consistently heavier crops with better fruit quality than any outdoor method. Almost all cordon types thrive under glass. Cordon plants need a vertical cane or string — tie or twist the main stem every 30-40cm. Remove all side shoots when under 2-3cm long. On warm days above 25C open vents and the door — poor ventilation causes blossom drop above 30C.

Suitable varieties: Gardener's Delight, Alicante, Sungold, Black Cherry, Tigerella, Shirley F1, Brandywine.

🛍️ Grow Bags

Two staked tomato plants with ripening fruit growing in a grow bag

Grow bags are the classic British tomato growing method — affordable, practical, and effective. A standard bag contains approximately 40 litres of growing medium, sufficient for two cordon plants or three bush types. Knead the bag thoroughly before cutting planting holes. Plant deeply, burying the stem to the lowest leaves. Use watering and feeding rings (collars) in the planting holes — without them, water runs off the surface without reaching the roots. Grow bag compost exhausts its nutrients after 4-6 weeks; begin a high-potash liquid tomato feed every 7-10 days after that. Never skip feeding in grow bags.

Suitable varieties: Cordon varieties (2 per bag) or bush types (3 per bag). Works well in greenhouse, polytunnel, sheltered porch, or against a warm south-facing wall outdoors.

🪣 Tubs & Containers

A tomato plant supported by canes in a large red fabric tub on a patio

Large containers offer more root space and better moisture retention than grow bags, and the advantage of being moveable. For cordon varieties, use a pot of at least 30-35cm diameter — 40cm is better. Bush varieties manage in 25-30cm pots. Use peat-free multi-purpose compost mixed with 20-25% perlite. Add a slow-release granular fertiliser at planting time. Raise pots on feet to improve drainage and air circulation. Containers with a built-in water reservoir are particularly effective — they maintain consistent moisture and reduce blossom end rot and fruit splitting.

Suitable varieties: All types. Cordons need a minimum 35cm pot and a sturdy cane. Trailing types are excellent in wide shallow containers.

🧺 Hanging Baskets

A hanging basket on a brick wall overflowing with trailing cherry tomatoes

Trailing and tumbling varieties produce a striking cascade of small, sweet fruits throughout summer. Use the largest basket you can manage — 40cm is ideal. Line with a coco fibre liner. Fill with peat-free compost mixed with water-retaining gel crystals, which make a significant practical difference in a basket that dries out rapidly in warm weather. Plant one plant in a 30cm basket, two in a 40cm basket. Hang in full sun. Water once or twice daily in warm summer weather. Begin a weekly high-potash liquid feed once the first flowers appear.

Suitable varieties: Tumbling Tom Red, Tumbling Tom Yellow, Hundreds & Thousands, Maskotka, Balconi Red only. Do not use standard or upright bush varieties.

🌍 Outside in Ground

A row of staked tomato plants with red fruit in a sunny border by a brick wall

Growing tomatoes in open ground gives plants the most root space and, in a warm summer, can produce superb results. Choose the sunniest, most sheltered spot available — ideally against a south-facing wall or fence. Dig in plenty of well-rotted manure or garden compost. Plants raised indoors must be hardened off over 10-14 days before planting out. A south-facing brick or stone wall significantly increases effective temperature — storing heat by day and releasing it at night.

Suitable varieties: Gardener's Delight, Alicante, Outdoor Girl, Tigerella, Red Alert. Beefsteak varieties will struggle to ripen outdoors north of the Midlands.

Keep apart from: Potatoes, Brassicas, Fennel, Sweetcorn

Potatoes and tomatoes share the same family (Solanaceae) and the same diseases — most critically blight, which can devastate both simultaneously.

06 Companion Planting

✅ Grow nearby

  • A healthy, leafy basil plant in a pot on a sunny windowsill

    🌿 Basil

    The classic tomato companion. Basil is thought to repel aphids and whitefly and improve the flavour of neighbouring tomatoes. Grow at the base of plants in the greenhouse or outdoors.

  • A bushy French marigold covered in orange and yellow flowers, used as a companion plant

    🌸 Marigolds

    French marigolds (Tagetes) deter whitefly in the greenhouse — one of the most reliably effective companion planting combinations. Plant in the same bed or in pots alongside.

  • A bunch of freshly pulled orange carrots with their feathery green tops

    🥕 Carrots

    Carrots loosen the soil around tomato roots and the two crops coexist well without competing. Tomatoes shade carrots beneficially in hot weather.

❌ Keep apart

  • 🥔 Potatoes — Same family (Solanaceae) — share blight. Keep on opposite sides of the garden.
  • 🥦 Brassicas — Compete for nutrients; brassicas prefer more alkaline conditions.
  • 🌿 Fennel — Fennel root chemicals inhibit growth of nearby vegetables.
  • 🌽 Sweetcorn — Tall sweetcorn casts shade and competes aggressively for nutrients.

07 Sowing — How To

Timing is everything with tomatoes. Sow too early and seedlings become tall and leggy before conditions allow planting out; sow too late and the season is cut short before all fruits ripen. The ideal sowing window falls between late January and mid-March for most UK growers.

  1. Filling a black modular seed tray with compost from a red scoop

    Fill trays

    Fill seed trays or modules to within 1cm of the rim with moist seed compost. Firm lightly but do not compress hard — seeds need air pockets to germinate well.

  2. Using a dibber to place tomato seeds into compost-filled cells

    Sow seeds

    Place one seed per module, or sow thinly in an open tray. Tomato seeds are large enough to handle individually.

  3. Sprinkling a fine layer of covering over sown cells in a seed tray

    Cover lightly

    Cover with a 3-5mm layer of vermiculite or fine-sieved compost. Vermiculite retains moisture and resists forming a crust.

  4. Writing a plant label for Gardener's Delight tomatoes beside a sown tray

    Label clearly

    Write the variety name and sowing date on each label. If growing more than one variety, this step is not optional.

  5. Watering a sown seed tray gently from a small red watering can

    Water gently

    Water with a fine rose. Moisten without disturbing seeds or creating waterlogged patches.

  6. Placing a clear vented lid over a seed tray to keep it warm

    Cover and warm

    Place a propagator lid or cling film over the tray. Position in a warm location — bottom heat of 18-25C is ideal. Check daily.

  7. A tray of young tomato seedlings on a bright windowsill

    Move to light

    Germination occurs in 5-10 days. Move seedlings immediately to a bright south-facing windowsill. Seedlings in low light become weak and spindly within days.

  8. Opening the vent on a propagator lid over a tray of seedlings

    Ventilate

    Remove the cover as soon as seedlings appear to allow airflow and prevent damping off.

  9. Lifting a tomato seedling by its leaf and moving it to its own pot with a dibber

    Prick out

    When seedlings have their first true leaves, prick out into individual 7-9cm pots. Handle by a seed leaf, never the stem.

Map of the UK and Ireland coloured by growing region, used with the regional timing table
Regional sowing timing
RegionSow / plantGrow / harvestNotes
Scotland & Far NorthFeb–MarApr–SepHeated propagator essential; low day length before March limits seedling quality · Late Feb – mid-March
Northern EnglandFeb–MarApr–SepPropagator strongly recommended; windowsill viable from late Feb · Mid-Feb – mid-March
Midlands & WalesFeb–MarApr–SepGood results from heated propagator in early Feb · Early Feb – mid-March
Ireland & Isle of ManFeb–MarApr–SepGood results from heated propagator in early Feb · Early Feb – mid-March
South & SE EnglandJan–MarApr–OctHeated propagator allows reliable late January start · Late Jan – early March
South Coast & SWJan–FebMar–OctEarliest reliable UK start; greenhouse growers can try early January · Late Jan – late Feb

08 Using a Propagator

A propagator is a miniature heated greenhouse — a tray with a close-fitting clear lid that traps warmth and humidity around germinating seeds. For tomatoes, a good propagator dramatically improves germination rates and allows you to start sowing earlier than would otherwise be possible.

A heated propagator with an electric cable on a windowsill, full of tomato seedlings

Heated propagator

Has a built-in electric heating element providing consistent bottom heat regardless of room temperature. The single most useful piece of equipment for an early start. Look for a model with a thermostat. Set to 20-22C for tomatoes.

Unheated propagator

Simply a lidded tray that traps ambient warmth. Placed on a sunny windowsill it helps, but performance depends entirely on room temperature. Better than nothing — significantly less reliable than a heated model. Best from March onwards.

A standard unheated propagator: seedlings in a red tray under a clear vented lid

Standard unheated propagator — A lidded seed tray traps warmth and humidity around germinating seeds without electricity. Performance depends entirely on room temperature — best placed on a warm windowsill and used from March onwards. Replace the lid promptly after watering. Remove it completely the moment seedlings emerge to prevent damping off.

  1. A digital probe thermometer reading about 20°C in a propagator of newly sown cells

    Set temperature

    Set thermostat to 20-22C and allow 30 minutes to warm before sowing.

  2. Tomato seedlings just pushing through the compost under a misted propagator lid

    Monitor daily

    The compost should remain consistently moist but never waterlogged.

  3. Lifting the propagator lid off a tray of young seedlings to let them cool

    Reduce temperature

    Once most seedlings are up, reduce to 16-18C to encourage compact, sturdy growth.

  4. Young tomato plants in individual pots on a bright windowsill

    Move to light

    Transfer seedlings to a bright windowsill promptly after germination. The lid reduces light transmission.

An empty lidded seed tray filled with compost
Windowsill alternative: A bright south-facing windowsill can substitute from late February. Place a clear polythene bag loosely over the pot during germination. Remove immediately once seedlings appear.

09 Soil Requirements

pH
6.0–6.8
Best
Loam, Sandy loam
Tolerates
Clay loam
Avoid
Waterlogged, Pure sand
💡 Deep, fertile, free-draining. Add compost generously.

10 Ongoing Care

Watering the base of a cordon tomato plant in a greenhouse bed with a watering can

💧 Watering

Water deeply and consistently — erratic watering causes blossom end rot and fruit splitting. In a greenhouse, water daily in summer; outdoors every 2–3 days. Always water at the base, never over the foliage. Consistent soil moisture is more important than quantity.

Pouring liquid tomato feed into a watering can in a greenhouse

🧪 Feeding

Begin a high-potash liquid tomato feed weekly once the first truss of flowers appears. Continue every 7–10 days throughout the season. Do not use high-nitrogen feeds during fruiting — they promote leafy growth at the expense of fruit.

A hand pinching out a side-shoot between the stem and a leaf of a cordon tomato

✂️ Side-Shooting Cordons

For cordon (indeterminate) varieties, remove side shoots weekly when they are under 2–3cm long — the wound closes quickly and the risk of disease is minimal. Bush and tumbling varieties need no side-shooting. Removing side shoots when small is always better than leaving them to grow large.

Tying a tomato stem loosely to a cane with twine in a greenhouse

🪢 Supporting & Tying In

Tie the main stem to its support every 20–30cm as it grows using soft twine or purpose-made tomato clips. Cordon tomatoes can reach 1.8m or more — ensure supports are firmly anchored. Check ties regularly and loosen any that are cutting into the stem.

11 Watch Out For

Warning

Watch for blight in warm, humid weather — brown patches on leaves and stems spreading rapidly. Remove affected material immediately and never compost it. Keep tomatoes and potatoes apart across the whole garden. Tomato brown rugose fruit virus is a notifiable disease. If you suspect it (mottled, wrinkled leaves and yellow or brown patches on the fruit), report it to the government plant health service where you live.

🐛 Insects & pests

  • 🐜 Aphids (Blackfly & Greenfly) — Curled, distorted, or stunted growing tips — aphids inject saliva that causes leaf curl to protect them
  • 🕷 Spider Mite — Fine, silky webbing on the underside of leaves and between growing tips — the definitive identification sign
  • 🐌 Slugs & Snails — Silver slime trails on leaves, soil, and pots — often the first sign before damage is found

🍄 Diseases to watch

  • 🟤 Late Blight — Late blight (Phytophthora infestans) is the most destructive disease in the UK kitchen garden. The same pathogen caused the Irish Potato Famine of the 1840s. In warm, humid conditions it spreads with terrifying speed — an entire crop of tomatoes can be destroyed within a week of the first lesion appearing.
  • 🩶 Botrytis (Grey Mould) — Botrytis cinerea (grey mould) is the most ubiquitous fungal pathogen in temperate gardens — present in virtually every garden soil and on plant debris. It becomes a disease only when conditions favour it: cool, humid, poorly ventilated environments with damaged or senescent plant tissue. In a greenhouse in autumn it can destroy an entire tomato or grape crop.
  • 🌿 Mosaic Virus (TMV / CMV) — Tobacco mosaic virus (TMV) and Cucumber mosaic virus (CMV) are among the most widespread plant viruses affecting vegetable crops worldwide. TMV is extraordinarily stable — it can remain viable on contaminated hands and tools for years, and even survives in processed tobacco. There is no cure; infected plants must be destroyed.
  • 🌿 Fusarium Wilt — Fusarium wilt (Fusarium oxysporum) is a soil-borne vascular disease that invades root systems and blocks the water-conducting tissue of the plant. Infected plants die of internal drought even with adequate soil moisture. Different formae speciales (strains) target specific host plants — asparagus fusarium is different to tomato fusarium.
  • ⬜ Powdery Mildew — Powdery mildew is caused by a range of related fungi, each specific to its host plant — courgette mildew cannot infect peas, and vice versa. The characteristic white powdery coating on leaf surfaces appears in warm, dry conditions (unlike downy mildew which prefers cool and wet). Rarely kills plants but severely reduces yield and plant vigour.

Full identification and treatment advice is in the Pests and Diseases sections.

12 Storage & Preserving

A bowl of ripe red tomatoes on a kitchen worktop

🍅 Fresh Storage

Store ripe tomatoes at room temperature, never in the fridge — cold destroys the volatile compounds responsible for flavour and texture irreversibly. A bowl on a sunny windowsill keeps ripe tomatoes in perfect condition for 3–5 days. Use slightly underripe tomatoes immediately after picking for best flavour.

Whole tomatoes on a tray beside a labelled freezer bag of frozen tomatoes

❄️ Freezing

Tomatoes freeze well and it is the best way to deal with a glut. Freeze whole, halved, or as passata. Once frozen they lose their texture and are only suitable for cooked dishes — soups, sauces, and stews. Freeze spread on a tray to keep fruits free-flowing, then bag. Use within 12 months.

A jar of homemade passata surrounded by fresh tomatoes, basil and garlic

🫙 Passata & Sauce

The best use of a large glut. Simmer roughly chopped tomatoes for 20 minutes, push through a mouli or sieve, season, then let it cool and freeze it in tubs or bags. Homegrown passata is incomparably better than shop-bought. A single row of cordon tomatoes can produce enough passata to last through winter.

Halved tomatoes slow-dried on a lined baking tray, with fresh tomatoes on the vine and sprigs of thyme on a wooden table

☀️ Slow-Drying

Slow-dry small and plum varieties at 100°C for 4–6 hours until semi-dried and intensely flavoured. Semi-dried tomatoes still hold some moisture, so they do not keep: put them in a covered container in the fridge and eat them within a few days, or freeze them. For tomatoes that keep for months, carry on drying until they are leathery and dry right through, then store them in airtight jars. Cherry and plum types are best for drying — large beefsteak varieties contain too much water.

13 Expert Tips

💡 Sow into individual modules rather than

Sow into individual modules rather than open trays wherever possible — roots in open trays are disturbed at pricking out and seedlings set back by 1–2 weeks. Module-grown plants go on faster and stronger.

💡 Germination temperature is the single biggest

Germination temperature is the single biggest variable in your control. Seeds at 22°C germinate in 5–7 days. The same seeds at 15°C take 3 weeks, if they germinate at all. A heated propagator earns its cost in the first season.

💡 Remove cordon side shoots when they

Remove cordon side shoots when they are under 2–3cm long — the wound closes within a day. Leave a side shoot to reach 10–15cm and you create a slow-healing wound and risk introducing disease.

💡 Consistent watering prevents blossom end rot

Consistent watering prevents blossom end rot more reliably than any calcium supplement. BER is almost always a symptom of irregular watering, not a mineral deficiency in the soil.

14 Common Mistakes

⚠ Sowing

  • Sowing too early — leggy seedlings exhaust compost nutrients before outdoor planting is safe
  • Covering seeds more than 5mm deep — tomato seeds need shallow sowing
  • Overwatering newly sown trays — moist not wet; soggy compost causes damping off
  • Growing on in low light — seedlings become irreversibly etiolated within days of germination

⚠ Ongoing Care

  • Irregular watering — wet-dry cycles cause blossom end rot and fruit splitting
  • Allowing cordon side shoots to grow large before removing
  • Feeding with high-nitrogen fertiliser during fruiting — promotes leaf at expense of fruit
  • Overcrowding plants in a greenhouse — poor air circulation encourages botrytis and blight
  • Stopping plants too late — late trusses will not ripen before the first frost

15 See Also

Open the full interactive tomatoes guide →Browse all 91 crops