Heirloom Tomatoes Explained (UK Guide)

Heirloom tomatoes are famous for their incredible flavour, unusual colours and fascinating history. But many UK gardeners aren’t quite sure what makes a tomato an heirloom, how they differ from modern varieties, or whether they are suitable for British conditions.

This guide explains what heirloom tomatoes are, how they grow, and whether they are worth growing in the UK climate.

For full cultivation advice, see TOMATOES: HOW TO GROW, BEST VARIETIES, PROBLEMS & EXPERT TIPS (UK GUIDE).

What Is an Heirloom Tomato?

An heirloom tomato is generally defined as:

• An open-pollinated variety
• Passed down through generations
• Not a modern hybrid
• Seed that grows true to type

Unlike hybrid tomatoes, heirloom seeds saved from a plant will produce plants identical to the parent. This is why they have been preserved by gardeners for decades — and sometimes centuries.

Heirloom vs Hybrid Tomatoes

Understanding the difference is important.

Heirloom Tomatoes

• Natural pollination
• Seeds can be saved
• Unique flavours
• Greater variation in size and shape

Hybrid Tomatoes

• Cross-bred intentionally
• Often higher yields
• More uniform fruit
• Better disease resistance

Many gardeners grow both: hybrids for reliability and heirlooms for flavour.

Why Heirloom Tomatoes Are So Popular

Heirlooms are grown mainly for taste.

They are often:

• Sweeter
• Richer
• More complex in flavour
• Less watery than supermarket tomatoes

They also come in striking colours including:

• Deep red
• Orange
• Yellow
• Green-striped
• Purple/black types

Are Heirloom Tomatoes Suitable for the UK?

Yes — but they need the right conditions.

Because heirlooms were often developed in warmer climates, they:

• Require a longer season
• Need warmth
• Are usually best under cover

In most of the UK, a greenhouse or polytunnel is strongly recommended.

See HOW TO GROW TOMATOES IN A GREENHOUSE for growing guidance.

Common Challenges With Heirlooms

Heirloom tomatoes can be slightly more demanding than modern hybrids.

Typical issues:

• Slower ripening
• Lower disease resistance
• More sensitive to cold
• Irregular fruit shapes
• Splitting if watering fluctuates

This doesn’t mean they’re difficult — just that they need stable conditions.

Why Gardeners Still Grow Them

Despite the challenges, gardeners love heirlooms because:

• Flavour is exceptional
• You can save seeds
• Plants feel unique and traditional
• They are excellent for cooking and salads

Many growers say one good heirloom tomato is worth several standard varieties.

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March is when the growing season truly begins. Seeds are being sown daily, beds are prepared and late frosts are still possible — these essentials help produce strong plants and a successful start.

Seed Trays, Modules & Propagation Kits — perfect for tomatoes, brassicas, lettuce, onions and flowers. 👉 Click here to see top options

Heated Propagators, Heat Mats & Grow Lights — improves germination and prevents leggy seedlings during cold nights. 👉 Click here to see top options

Seed & Cutting Compost — essential for healthy seedlings and strong root growth. 👉 Click here to see top options

Garden Fleece & Plant Protection Covers — protects seedlings, potatoes and early plantings from late frost. 👉 Click here to see top options

Spring Vegetable Seeds — carrots, beetroot, peas, spinach and salads can all be started now. 👉 Click here to see top options

Garden Kneeler & Seat — makes long sowing and planting sessions far more comfortable. 👉 Click here to see top options

Pressure Washer (Greenhouse & Patio Cleaning) — clean patios, paths and greenhouses before planting. 👉 Click here to see top options

Solar Garden Lights — perfect for enjoying the garden during brighter spring evenings. 👉 Click here to see top options

Can You Save Seeds From Heirloom Tomatoes?

Yes — this is one of their biggest advantages.

Because they are open-pollinated:

• Seeds remain true to type
• You can re-grow your favourite plant each year
• Plants gradually adapt to your garden conditions

This makes them popular with allotment growers and seed savers.

Best Conditions for Growing Heirloom Tomatoes in the UK

For best results:

• Grow under cover
• Provide strong support
• Feed regularly
• Maintain consistent watering
• Choose a sunny location

They benefit especially from warm, stable temperatures.

Heirloom Flavour vs Yield

One key difference:

• Hybrids → higher yield
• Heirlooms → better flavour

If your goal is maximum harvest, hybrids often win.
If your goal is taste, heirlooms are hard to beat.

Are Heirloom Tomatoes Good for Beginners?

They can be — but with the right setup.

Best for beginners who:

• Have a greenhouse or sheltered area
• Can water regularly
• Want to experiment with flavour

Outdoor beginners may find modern cherry tomatoes easier.

Final Thoughts

Heirloom tomatoes bring history, flavour and character into the garden. While they require slightly more care than modern hybrids, they reward growers with some of the best-tasting tomatoes you can produce at home.

If you want tomatoes that truly taste different from shop-bought fruit, heirlooms are well worth growing.

Return to TOMATOES: HOW TO GROW, BEST VARIETIES, PROBLEMS & EXPERT TIPS (UK GUIDE) for complete tomato growing guidance.