Best Dahlias to Grow — UK Buying Guide

Contents

1 What Are the Best Dahlias to Grow in the UK?
- 1.1 Related guides
2 Which Dahlia Types Perform Best in UK Gardens?
3 What Are the Best Dahlias for Cutting?
4 Which Dahlias Are Best for Bees and Pollinators?
5 What Are the Best Dahlias for Garden Borders?
6 What Are the Best Dahlias to Grow in Pots?
7 How Do I Choose Dahlias by Colour Scheme?
8 Which Dahlias Are the Easiest to Grow for Beginners?
9 Cactus Dahlias vs Decorative Dahlias — Which Should You Choose?
10 When Should You Plant Dahlia Tubers in the UK?
11 Do You Need to Lift and Store Dahlia Tubers Over Winter?
12 Frequently Asked Questions
13 Related Products
14 Related Articles

What Are the Best Dahlias to Grow in the UK?

The best dahlias to grow depend on your garden style, available space, and how you intend to use the flowers — whether cutting for the vase, filling borders with colour, or attracting pollinators. Dahlias are divided into distinct groups by flower form, and choosing the right type is the single most reliable way to ensure satisfaction. With hundreds of varieties available, this guide narrows the field to the forms and named varieties that perform consistently well in UK gardens.

Related guides

Growing Dahlias in Pots — Container Guide

Which Dahlia Types Perform Best in UK Gardens?

Decorative, cactus, ball, pom pom, waterlily, and the Bishop series of single dahlias all perform reliably in the British climate, though each suits different purposes. Understanding the main groups before buying saves considerable disappointment.

The UK growing season — typically May to October — suits dahlias well. They thrive in warm, frost-free months and flower prolifically from midsummer until the first frosts. The key differences between types lie in flower size, stem length, petal structure, and wildlife value.

Dahlia Type	Flower Size	Best For	Plant Height
Decorative / Dinnerplate	Large–Very large	Cutting, bold borders	90–150 cm
Cactus	Medium–Large	Cutting, textural borders	90–130 cm
Ball	Small–Medium	Cutting, formal borders	90–120 cm
Pom Pom	Small	Cutting, mixed borders	80–110 cm
Waterlily	Medium–Large	Cottage gardens, cutting	90–120 cm
Single / Bishop types	Small–Medium	Wildlife gardens, borders	70–100 cm

For a deeper look at classification, see our Types of Dahlias — Classification Guide.

What Are the Best Dahlias for Cutting?

For cut flowers, ball, cactus, and decorative dahlias are the top choices because their blooms last well in the vase and are produced on long, straight stems. Frequent cutting also encourages the plant to produce more flowers, so a well-managed cutting patch becomes more productive as the season advances.

When choosing varieties for cutting, prioritise those described as producing multiple stems rather than a single large central bloom. Stem length matters too — aim for varieties reaching at least 90 cm so you have usable stem below the flower head.

Recommended cutting varieties from Ashridge Trees:

Boom Boom White — a large, pure white decorative dahlia; exceptional in monochrome arrangements.
Baccara — deep burgundy ball dahlia with perfectly formed blooms on strong stems.
Ariston — white ball dahlia; prolific and very long-vase-life.
American Sun — rich golden-yellow cactus type; striking in warm-toned arrangements.
Break Out — vibrant mix of orange and red tones; reliable stem production.

Browse the full range at Shop All Dahlias.

Which Dahlias Are Best for Bees and Pollinators?

Single-flowered dahlias, including the Bishop series, are by far the best choice for pollinators because their open centres give bees and hoverflies direct access to pollen and nectar. Fully double varieties — however beautiful — offer very little to wildlife.

The Bishop series deserves special attention. These semi-double or single dahlias combine dramatic near-black or bronze foliage with jewel-coloured flowers, making them exceptionally ornamental as well as wildlife-friendly. They are also somewhat hardier than many dahlias and tolerate a wider range of conditions.

Bishop series varieties available from Ashridge Trees:

Bishop of Llandaff — the classic; vivid scarlet flowers, dark bronze foliage. An RHS Award of Garden Merit holder.
Bishop of Auckland — deep plum-pink flowers over near-black leaves.
Bishop of Leicester — soft lilac-pink flowers; slightly lighter foliage than others in the series.
Bishop of York — warm apricot-yellow flowers; extremely showy in borders.

What Are the Best Dahlias for Garden Borders?

For borders, the most effective dahlias are those with strong stems that do not require excessive staking, and which offer a long flowering period rather than a single flush. Waterlily dahlias and medium decorative types are particularly well suited because their proportions complement other border plants without overwhelming them.

Foliage colour is also worth considering. Varieties with dark or bronze leaves — such as the Bishop series and Brown Sugar — provide contrast throughout the growing season even before the first buds open. Pale-flowered varieties with green foliage work well against hedges or dark-painted fences.

Variety	Type	Flower Colour	Border Role
Brown Sugar	Decorative	Warm bronze-orange	Mid-border focal plant
Bora Bora	Decorative	Deep purple-red	Back-of-border drama
Beatrice	Waterlily	Soft pink	Cottage-style mid-border
Ambition	Decorative	Purple	Bold back-of-border
Bergers Record	Cactus	Salmon-pink	Textural mid-border

What Are the Best Dahlias to Grow in Pots?

Pom pom and waterlily dahlias are the best types for containers because they remain more compact than cactus or large decorative varieties and their stems are less likely to snap in exposed positions. Ball dahlias also perform well in large pots provided they receive consistent watering and feeding.

The most important factor with container dahlias is pot size — use a minimum 30-litre pot for a single tuber and ensure drainage holes are not blocked. Dahlias in containers are wholly dependent on the gardener for water and nutrients, so a weekly high-potash liquid feed once flowering begins is essential. See our full guide to Growing Dahlias in Pots for detailed advice.

Good compact or pot-friendly varieties:

Arbatax — ball dahlia in rich ruby-red; manageable height for large containers.
Bishop of Llandaff — compact enough for a large pot; the dark foliage is particularly effective in containers.
Boom Boom White — a large bloom on a moderately compact plant; spectacular as a solo specimen.

Browse Pom Pom Dahlias and Waterlily Dahlias for more container-friendly options.

How Do I Choose Dahlias by Colour Scheme?

Dahlias offer one of the widest colour ranges of any garden plant, from purest white through every shade of pink, red, orange, yellow, and purple to near-black. Selecting varieties to suit a planned colour scheme rather than buying on impulse produces far more satisfying results.

Colour Scheme	Recommended Varieties	Notes
White & cream	Boom Boom White, Ariston	Luminous at dusk; pairs with dark foliage
Hot reds & oranges	Bishop of Llandaff, Break Out, American Sun	High-impact; suits late-season planting schemes
Warm bronze & caramel	Brown Sugar, Bishop of York	Sophisticated; works with grasses and sedums
Pinks & lilacs	Beatrice, Bishop of Leicester, Bishop of Auckland	Romantic; excellent with roses and salvias
Deep purples & burgundy	Ambition, Baccara, Bora Bora	Moody and opulent; striking against pale gravel

Which Dahlias Are the Easiest to Grow for Beginners?

Ball dahlias and the Bishop series are the most forgiving choices for beginner growers because they are vigorous, produce a high number of blooms per plant, and generally require less intervention than large dinnerplate varieties. Cactus dahlias can be slightly more prone to petal damage in wet weather, so are better suited once you have a season’s experience.

Regardless of type, the single most important thing any grower can do — beginner or experienced — is pinch out the growing tip when the plant reaches 30–40 cm. This forces the plant to branch and produces far more flowers than a plant left to grow unpinched. Read our full How to Grow Dahlias — Complete UK Guide for step-by-step instructions.

Good beginner varieties:

Bishop of Llandaff — almost bullet-proof; blooms freely with minimal attention.
Arbatax — ball type; very reliable and free-flowering.
Bergers Record — a classic cactus dahlia; strong stems and a long season.

Cactus Dahlias vs Decorative Dahlias — Which Should You Choose?

Cactus dahlias have narrow, quilled petals that curl backwards to create a spiky, dynamic flower; decorative dahlias have broad, flat or slightly rolled petals arranged in dense, rounded blooms. Both types make excellent cut flowers, but the choice comes down to the aesthetic you want.

Feature	Cactus Dahlias	Decorative Dahlias
Petal form	Narrow, quilled, spiky	Broad, flat, rounded
Visual effect	Textural, informal	Bold, formal
Wet weather tolerance	Moderate	Good
Best for	Informal cutting gardens, mixed borders	Statement borders, formal arrangements
Example variety	American Sun	Ambition

Browse Cactus Dahlias and Decorative / Dinnerplate Dahlias to compare the full ranges side by side.

When Should You Plant Dahlia Tubers in the UK?

Dahlia tubers should be planted outdoors once the risk of frost has passed — typically late April to mid-May in southern England, and May to early June in northern England and Scotland. Alternatively, pot tubers up indoors in March or April to get a head start on the season.

Starting tubers early indoors in pots on a bright windowsill or in a frost-free greenhouse is particularly worthwhile for large decorative and cactus varieties, which benefit from a longer growing season. For detailed instructions on this technique, see our guide to Starting Dahlia Tubers — Potting Up Indoors.

When you receive tubers from Ashridge Trees, check them carefully before planting. A healthy tuber should be plump and firm. Look for the crown — the point where the tubers meet the old stem — as all new growth emerges from buds (eyes) located here, not from the tubers themselves. Our guide to Dahlia Eyes and Crowns Explained covers this in detail.

Do You Need to Lift and Store Dahlia Tubers Over Winter?

In most parts of the UK, dahlia tubers should be lifted after the first frost blackens the foliage, dried, and stored in a frost-free location over winter. In mild coastal areas of the south-west, deeply mulched tubers can sometimes be left in the ground, but this is a risk and lifting remains the reliable method.

After lifting, allow tubers to dry for a week or two in a cool shed before storing them in slightly damp compost, coir, or vermiculite in a frost-free but cool place. Check periodically through winter for signs of rot or desiccation. Full instructions are available in our guide to Overwintering Dahlias — Lifting, Storing and Replanting.

Frequently Asked Questions

How many flowers will one dahlia tuber produce?

A single well-grown, pinched dahlia tuber can produce 20–40 blooms over the season, depending on variety and growing conditions. Regular deadheading and cutting significantly increases total flower output.

Are dahlias perennial or annual in the UK?

Dahlias are frost-tender perennials. The tubers survive year after year if lifted and stored correctly over winter, making them excellent long-term investments for the garden.

What is the best dahlia for a beginner to start with?

Bishop of Llandaff is widely considered the most reliable starting point — vigorous, beautiful, and genuinely low-maintenance compared with large double varieties.

Which dahlias have the longest vase life?

Ball and pom pom dahlias, such as Ariston and Baccara, typically last 5–7 days in a vase when cut at the correct stage and conditioned properly in deep cold water.

Can I grow dahlias in shade?

Dahlias need a minimum of 6 hours of direct sun daily to flower well. They will grow in partial shade but produce fewer, weaker blooms. Full sun is strongly preferred for best performance.

What soil do dahlias prefer?

Dahlias prefer free-draining, moderately fertile soil with a pH of around 6.5. Heavy clay that waterlogged in winter will rot tubers; improve drainage by incorporating grit and organic matter before planting.

Do dahlias need staking?

Tall varieties — particularly large decorative dahlias over 90 cm — should be staked at planting time before the tuber sprouts. Ball and pom pom types on shorter stems are often self-supporting in sheltered positions.

How often should I water dahlias?

Water sparingly until shoots appear, then increase to a deep watering 2–3 times weekly in dry spells. Overwatering newly planted tubers before they sprout is one of the most common causes of failure.

When do dahlias flower in the UK?

Tubers planted outdoors in May typically begin flowering in late July or August. Tubers started indoors in March can flower from late June. All types continue until the first hard frost.

Do pom pom and ball dahlias differ?

Yes. Ball dahlias have slightly larger flowers (over 5 cm) with blunt-tipped petals; pom pom dahlias are smaller (under 5 cm) with rounder, more globe-like blooms. Browse Ball Dahlias and Pom Pom Dahlias to compare.

Are dahlias good for wildlife?

Single and semi-double dahlias — especially the Bishop series — are excellent for bees and hoverflies. Fully double varieties provide very little wildlife value as their pollen and nectar are inaccessible to insects.

Can I order dahlia tubers online from Ashridge Trees?

Yes. Ashridge Trees despatches named dahlia tubers by mail order throughout the UK. Browse the full selection at Shop All Dahlias and order for spring delivery.