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Discover the best giant dahlias
Choosing planting

Discover the best giant dahlias

For vibrant scenes

Contents

Modified the Tuesday, 5 August 2025  by Virginie T. 3 min.

Among all dahlias, the Giant Dahlias are among the most spectacular: They bear the largest flowers measuring 15 to 35 cm in diameter, and some have tall stems that can reach up to 2 m in height! Like their most proud representative, the Dahlia imperialis or Bamboo Dahlia.

With their large, full flowers and sometimes impressive height, Giant Dahlias are widely used in the background of flower beds to create an interesting focal point. You are sure to find one that suits you among the more than 30 varieties, some of which are exclusive, that we offer.

Whether you are looking for flower size or stem height, discover their characteristics to make the right choice and find out about the best of the Dahlia ‘Café au Lait’ and the bicolour ‘Myrtle’s Folly.’

Difficulty

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Take to the heights

Some Giant Dahlias are impressive due to their size: their tall stems can reach up to 3 m in height! They are perfect for structuring a flowerbed with their imposing stature or to serve as a focal point in the background of a mixed border of perennials or in the vegetable garden. They also make stunning bouquets.

The tallest: Dahlia Imperialis

Also known as Tree Dahlia or “Bamboo Dahlia” because its stem resembles that of the latter. This arborescent giant measures between 2 to 4 m and may therefore require staking. It will thrive in full sun and sheltered from the wind. It blooms slightly later than others, from late August to November. Its pale pink or white flowers, small in size, reach 10 to 15 cm in diameter.

The Dahlia Imperialis is an impressive arborescent plant

Taller than three apples!

Dahlia Blith Spirit

Dahlia Blith Spirit

Spectacular for its size!
  • Flowering time August to December
  • Height at maturity 1,50 m
Dahlia Bohemian Spartacus

Dahlia Bohemian Spartacus

Among the tallest!
  • Flowering time August to December
  • Height at maturity 1,50 m
Dahlia Otto's Thrill

Dahlia Otto's Thrill

Its tall silhouette is perfect for structuring borders
  • Flowering time August to December
  • Height at maturity 1,50 m

Read also

Dahlia: planting, care and growing tips

The largest flowers

The Giant Dahlias are those that bear the largest flowers, which can reach over 25 cm in diameter: some are as big as a plate! This type of dahlia is perfect for brightening up a bed of light perennials, a corner of the vegetable garden, or creating generous bouquets. Here’s a small selection of the biggest flowers.

XXL heads

Dahlia Café au Lait

Dahlia Café au Lait

Impressive beige-pink flowers
  • Flowering time August to November
  • Height at maturity 1,20 m
Dahlia Kelvin Floodlight

Dahlia Kelvin Floodlight

It produces enormous, very double flowers
  • Flowering time August to November
  • Height at maturity 1 m
Dahlia Lady Darlene

Dahlia Lady Darlene

Giant flowers up to 22 cm in diameter
  • Flowering time August to December
  • Height at maturity 80 cm
Dahlia Lady Liberty

Dahlia Lady Liberty

One of the most beautiful giant dahlias
  • Flowering time August to November
  • Height at maturity 1,20 m
Dahlia Life Force

Dahlia Life Force

An exclusive with enormous flowers!
  • Flowering time August to December
  • Height at maturity 1,10 m

Discover other Giant Dahlia

Dahlia géant Vassio Meggos - Dahlia décoratif géant lavande
Dahlia Vassio Meggos
Out of stock
From 4,30 € • Bulb
Dahlia géant Café au Lait rosé
Dahlia Café au Lait Rosé
Out of stock
From 3,90 € • Bulb
Dahlia géant Bodacious
Dahlia Bodacious
Out of stock
From 4,30 € • Bulb
Dahlia Café au Lait Royal
Dahlia Café au Lait Royal
Out of stock
From 4,30 € • Bulb
Dahlia Islander
Dahlia Islander
Out of stock
From 4,30 € • Bulb
Dahlia Bohemian Spartacus
Dahlia Bohemian Spartacus
Not to be missed!
Out of stock
From 5,20 € • Bulb
Dahlia géant Café Au Lait Suprême
Dahlia Café au Lait Supreme
Out of stock
From 4,30 € • Bulb
Dahlia géant Otto s Thrill
Dahlia Otto's Thrill
Out of stock
From 4,30 € • Bulb
Dahlia Grand Prix
Dahlia Grand Prix
Out of stock
From 3,60 € • Bulb
Dahlia Moonlight Sonata
Dahlia Moonlight Sonata
Out of stock
From 4,30 € • Bulb
View all →

Our favourite varieties

 

Dahlia Spartacus

Dahlia Spartacus

Incredible with flowers over 20 cm in a dark red colour.
  • Flowering time August to December
  • Height at maturity 90 cm
Dahlia Café au Lait

Dahlia Café au Lait

Huge flowers in a cream colour, rare among dahlias.
  • Flowering time August to November
  • Height at maturity 1,20 m
Dahlia Myrtle's Folly

Dahlia Myrtle's Folly

Huge frilled flowers in a peach orange colour
  • Flowering time August to November
  • Height at maturity 1,20 m
Dahlia Emory Paul

Dahlia Emory Paul

We love its XXL pink pompom flowers.
  • Flowering time August to December
  • Height at maturity 1,30 m
Dahlia Gitts Perfection

Dahlia Gitts Perfection

Huge flowers in a soft pink gradient.
  • Flowering time August to December
  • Height at maturity 1,30 m

Read also

Dahlias: how to combine them in the garden?

Good to know

If these varieties of Dahlias withstand the wind well, it is necessary to stake them to prevent them from bending under the weight of the flowers.

Pinching is essential to obtain larger flowers; for this, remove all flower buds as they appear, keeping only one or two per stem. The flowers that will develop may, in some cases, exceed 30 cm in diameter, like the variety ‘Emory Paul’, which gives excellent results. The stems, being more fragile, must be staked very high to support the weight of the flowers.

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