Technical sheet

Type of plant: so-called “bulbo” plant, with tuberous root
Dimensions: from 0.20 to 1.30 m.
multiplication: sowing or division
Planting: spring

Bloom : July to October
Exposure : Sun
Soil: deep, rich and fresh
Watering: plentiful in summer
Rusticity: not very rustic

Dahlia Growing Conditions

If you wish to obtain an early flowering, think in late March – early April to plant the tubers stored under cover during winter.

  • To do this, install individually in a pot, in a flexible mixture, and place everything at the right temperature (10-12°).
  • As soon as the shoots come out of the ground, place the pots in the light.
  • Plant in April-May.
  • In autumn, and just after the first frost, dig up the tubers.
  • Trim the stems to 15 cm and do not delay in attaching an explicit label to them to avoid any subsequent mixing.
  • Transfer to the crate in a cool and ventilated room, frost-free.
  • In regions with mild winters, and in well-drained soil, the stumps can be left in place, possibly protected by mulch.
  • However, consider divide every two years to maintain lush vegetation.

Try to grow dahlias with the moon

When and how to plant dahlia bulbs?

The planting traditional, directly in the ground, takes about three weeks before the end of the frostslate April to May.

  • Bury the tubers 5-10 cm deep.
  • These plants being very greedy, incorporate many manure and organic fertilizer while providing, therefore, a strong tutor in order to support the tallest varieties.
  • Space the plants 30 to 90 cm apart depending on the variety.

Watering the dahlia

the dahlia is, by nature, a watery plant and it therefore requires continuous watering, carried out at the base and not on the foliage, this during the summer months in order to maintain vigorous vegetation.
Count twice a week during the heat wave. If necessary, in the cut flower garden, install a perforated, drop-by-drop or microporous pipe on the row to facilitate watering.


We have already said that these are voracious plants.

  • In fact, bring, in addition to the basal manure, a shot oforganic fertilizer in late summer to support vegetation. These plants respond quickly to liquid fertilizers.
  • Nevertheless, don’t feed them at the risk of favoring the appearance of aphids opportunists or weakening of the stems.

Size of the dahlia

If the tubers produce only one stem, it will be good to pinch for force branching.

What exposure for dahlias: where to plant them?

The dahlia likes the full sun. Reserve the sunniest and warmest location for dahlias, whether in the ground or in pots.
Sensitive to late frosts, these exotic plants must be planted in warm soil, loosened and enriched with mature compost.

Dahlia propagation

The division of tubers takes place at the end of storage, as soon as the small buds are visible. count two to three per flash. A greater number of shoots does not necessarily guarantee a more vigorous or floriferous plant.
the sowing is practiced hot, from March, in a terrine. Proceed to a transplanting in pots before setting up the plants in mid-May, after the Ice Saints.

Dahlia species and varieties

Dahlias are generally categorized by size and flower shape. By using various varieties, we give life and body to the beds and mixed-borders for several months.

Cactus and semi-cactus dahlias

Their large, double flowers display thin, pointed petals (ligules). ‘Alfred Grille’, two-tone bright pink with a yellow heart, 1.20 m; ‘Kenora Macob’ with almost black garnet petals, forked, 1.20 m; ‘Le Magnifique’, with forked ligules, orange with yellow tips, 1.20 m; ‘Tsuki Yori No Shisha’ with large spidery pure white flowers, 1.10 m.

Decorative dahlias

They are distinguished by ample flowers, with more or less wide petals, they seem less aggressive than the previous ones. ‘Tartan’ with an old-fashioned look, with garnet ligules variegated with white, 1.20 m; ‘Akita’ and ‘Vancouver’ with flowers reminiscent of chrysanthemums, reddish brown and pinkish purple dotted with white, 1 m; ‘Grand Prix’, lemon yellow with white tips, 1 m; ‘Arabian Night’ almost black red, 1.10 m; ‘Gerrie Hoek’, sugared almond with cream heart, 1.20m

The giant dahlias

They are recognizable from afar by their decorative dahlia flowers, enormous, up to more than 35 cm in diameter. The budding leads to exceptional flowers: ‘Emory Paul’, dark pink, 1.40 m; ‘Hamari Gold’ solid orange, 1.10 m; ‘Café au lait’, cream yellow, 1.20 m.

Double semi-dwarf dahlias

They are perfect for forming groups, in groups of three or five, and are therefore dapper in beds: ‘Border Princess’ a classic salmon orange with fluted petals, 60 cm; ‘Park Princess‘, its pendant in cream-lit pink, 70 cm; ‘Playa Blanca’ crisp white, 70 cm.

Dahlias balls and pompoms

They are typical with their fluted flowers in small balls forming a honeycomb: ‘Eveline’, white suffused with mauve, 1.10 m; ‘King of Yellows’ , solid yellow, 1 m; ‘Radja’ black garnet, 1.10 m.

Frilled dahlias

Their simple flowers adorn themselves with a ruffled and contrasting heart: ‘Eos’ red with a yellow collar, 1.60 m; ‘Alstergruss’ orange with yellow heart, 40 cm.

Simple dahlias

They are always prized for their good-natured presence: ‘Cupido’ , white with purple cockade, 50 cm; ‘Nimbus’, white with lemon yellow cockade, 50 cm; ‘Cory’, very soft pink, 80cm; ‘Etoile des Neiges’, pure white, 60 cm; ‘Tartarus’ of a velvety black garnet, 1.60 m.

Dwarf, miniature and top-mix dahlias

With single flowers, they are mainly used in containers and planters, possibly in borders: ‘Amour’ white bordered with pink, 35 cm; ‘Zodiac’, bright purple, 40cm; ‘Golden Sand’, yellow, 45cm;

Dahlias ‘Gallery’

Very beautiful modern selection, compact and floriferous, elegant, with decorative type flowers: ‘Sisley’ lilac pink with purple reflections, 40 cm; ‘Cézanne’, bright yellow, 40 cm; ‘Singer’ bright red, 40 cm.

Dahlias with also decorative foliage

They are very fashionable with their dark, almost black leaves: ‘Bishop of Llandaff‘ with semi-double, vermilion flowers and laciniate leaves, 80 cm; ‘Ellen Houston’ semi double orange-red, 50cm; ‘Sunshine’, orange-yellow with red centre, 50 cm; ‘Fascination‘, semi double, bright pink, 70 cm; ‘Candy Eyes’ candy pink with darker median, 70 cm; ‘Knockout’, lemon yellow; 70cm.

New Dhalias Label Rouge 2017

At the beginning of this year, around ten varieties of dahlias joined the list of those having received the Label rouge since 2011.

Among the certified, let us quote some obtainings Ernest Turkish.
The dwarf dahlia ‘Treat’ (50-60 cm), in pink and white, is thus very attractive. On the side of rare colors, ‘Hepken’ measures 70 to 80 cm in height and flourishes in red velvet embroidered with gold. As for ‘Macaroon’ (60 cm), it displays an old pink flower and a purple heart.

The essence of these introductions is however made up of very different creations signed Delbard-Nova-Flore :
‘Mercury’ (40-50 cm), a deep burgundy, or even ‘La Sierra’ (50-60 cm), with its big balls of red flowers… As for the dahlia cactus lace ‘Garry Ryan’ (80 to 100 cm), with its large pale yellow flowers, it does not require staking despite its height – an ideal variety as a cut flower.

All the novelties, thanks to their generous flowering, will enchant the beds for the larger sizes, and the pots, for the dwarf species.

By Me

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