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Dahlia Vulcan

Dahlia Vulcan
Dahlia

3,7/5
2 reviews
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Took a long time to come out, end of August. But a beautiful dahlia.

elisabeth, 14/10/2024

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More information

A giant dahlia with huge flowers, 17cm (7in) in diameter. The semi-cactus double flowers boast a vermillion red colour with cream tips and a yellow reverse. It blooms from July to October. It is a very colourful variety for the garden, and the cut flowers are perfect for bouquets.
Flower size
17 cm
Height at maturity
1.20 m
Spread at maturity
60 cm
Exposure
Sun
Hardiness
Hardy down to -6°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time March to May
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Flowering time July to November
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Description

Dahlia 'Vulcan' is a vigorous variety that produces large semi-cactus flowers. Its fully double blooms display a vibrant red colour with creamy tips and a yellow reverse. It blooms from July to October. It will bring vibrancy to sunny flower beds, and its long stems are perfect for cut flowers.

 

Dahlias belong to the Asteraceae family and are originally from the high plateaus of Mexico. There are currently thousands of horticultural varieties that have conquered gardens worldwide.

The 'Vulcan' variety is classed as a giant dahlia due to its 1 to 2m (3 to 7ft) height and 60 to 80cm (24 to 32in) width. It is also classified as a semi-cactus dahlia, a horticultural category defined by the shape of the flower. In this group, the coloured ligules of the head partially curl up for at least 1/3 of their length. Flowering begins in July and ends in October. The heads measure 17cm (7in) in diameter, and the ligules are a reddish-orange colour with cream tips and a yellow reverse. The habit is bushy and erect, and the highly branched stems are hollow. Its leaves are opposite, pinnately divided into 3 or 5 toothed lobes. The leaves and stems are dark green.

 

Remove faded flowers to encourage new blooms. You can use cut flowers to make colourful bouquets, combining them with other varieties.

'Vulcan' pairs particularly well with blue and yellow blooms, especially delphiniums and phlox paniculata. In a flower bed, it will perfectly complement echinaceas, heleniums, and cosmos, for example. It will also create a lovely combination with sedums and miscanthus.

Dahlias are stars of borders and ornamental gardens, confidently accompanying the most beautiful flowers. However, they are also appreciated alongside vegetable plants. In Mexico, this tuberous plant was first cultivated as a root vegetable for consumption. Its poor taste qualities quickly saw it categorised as an ornamental plant. Since then, the interest in their beautiful exuberance has never waned.

 

Dahlia Vulcan in pictures

Dahlia Vulcan (Flowering) Flowering

Plant habit

Height at maturity 1.20 m
Spread at maturity 60 cm
Growth rate fast

Flowering

Flower colour orange
Flowering time July to November
Inflorescence Flower head
Flower size 17 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Botanical data

Genus

Dahlia

Cultivar

Vulcan

Family

Asteraceae

Other common names

Dahlia

Origin

Cultivar or hybrid

Product reference67851

Planting and care

Plant in spring as soon as the last frost has passed. For abundant flowering, plant the tubers in full sun in rich, moist but well-drained soil. Stagnant moisture causes tuber rot. Amend the soil with compost and sand, if necessary. Work the soil deeply and enrich it, for example, with crushed horn or dehydrated blood. Place your tuber and crumble the soil well to fill without air pockets. Cover with about 6cm (2in) of soil. At the end of planting, water once abundantly and then repeat this watering regularly during the first 6 weeks to help with rooting. 

Dahlias are sensitive to cold, so they need to be overwintered. Dig the tubers up when the first frost has blackened the foliage. Carefully remove the tubers. Remove as much soil as possible. Let the foliage dry so that the tubers can replenish their reserves. Then cut the stems to 10cm (4in). Spread your bulbs in a box lined with newspaper. Store them in a frost-free, dry, cool, and dark place, such as a garage or attic. In mild regions without frost, or those close to the coast, it is possible to leave them in place. In this case, simply cover the ground with a carpet of leaves or straw for protection.

This tall dahlia, with its hollow stems, is not resistant to wind or heavy rain. You can stake it, but this is not particularly aesthetically pleasing. To remove the need for staking, you can pinch the stems early or remove the axial flower buds to spread out the plant's habit, which will improve its resistance to bad weather. This also channels the flow of sap to a single flower, which will become larger and sturdier.   

Planting period

Best planting time March to April
Recommended planting time March to May
Planting depth 15 cm

Intended location

Suitable for Meadow
Type of use Border, Back of border
Hardiness Hardy down to -6°C (USDA zone 9a) Show map
Ease of cultivation Amateur
Planting density 3 per m2
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Well-drained, deep, fertile.

Care

Pruning instructions Remove faded flowers regularly.
Pruning Pruning recommended once a year
Pruning time July to September
Soil moisture Moist soil
Disease resistance Good
Overwinter Needs to be stored
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