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Dahlia Hemisphere

Dahlia Hémisphère
Dahlia

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The flowers of this Dahlia are semi-double, well open, of medium size, two-tone, with each petal randomly coloured and striated with violet on a white background. Each one has its own personality. They are borne on dark-coloured stems of 90cm (35in), well above the foliage. This beautiful bush blooms from July until the frosts, and its flowers are very long-lasting in bouquets.  
Flower size
11 cm
Height at maturity
90 cm
Spread at maturity
60 cm
Exposure
Sun
Hardiness
Hardy down to -4°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

The 'Hemisphere' Decorative Dahlia offers charming flowers, resembling water lilies, of medium size, beautifully bicolour, all different. They compose, in a vase as well as in the garden, subtly variegated bouquets ranging from pink to violet-red and white. The flowers are semi-double, well open, of medium size, carried well above the foliage by sturdy stems, of a rather dark colour. And the sight of this flowering is constantly renewed from July until the frost. 

Dahlias are tuberous plants of the large family of asters, they are originally from the high plateaus of Mexico. Currently, the thousands of horticultural varieties obtained by man have invaded, to our greatest pleasure, gardens all over the world. Dahlias are classified according to the shape of their flowers. 'Hemisphere' is classified in the category of Decorative Dahlias. In this group, the colored ligules of the head are arranged regularly in a spiral, they can be bent towards the stem or curled for example. In this variety, the heads measure between 10 and 12cm in diameter and their ligules are rather large, widely ovate, almost flat, arranged like those of water lilies. The flowering takes place from July to October-November. Depending on the maturity of the flower, but also depending on each individual, the ligules or petals are more or less coloured and streaked with violet tones on a white background. The plant will reach a height of 90cm (35in) on average, and 50 to 60cm (20 to 24in) in width, the habit is bushy and upright. The very branched stems are hollow and the leaves are opposite, pinnately divided, that is to say, they are divided into 3 or 5 leaflets, which form very denticulate lobes. The leaves are fairly dark green and the stems, sturdy, more or less tinged with purple. 

To promote flowering and extend the flowering period, be sure to remove faded flowers. Better yet, regularly compose attractive colourful bouquets by combining various varieties. Decorative Dahlias go well with Gauras and Cleomes which will lighten their generous silhouette. The flowers of 'Hemisphere' also allow many associations in floral compositions, with the small cluster roses of 'Bouquet Parfait' and Statices for example. The average size of this variety makes it suitable for the centre of mixed borders, to structure a composition of colourful foliage shrubs and lower plants. The flowering of Echinaceas is perfect as an accompaniment to Dahlias, they bloom simultaneously, as do shrub salvias for example. Also consider grasses that take on beautiful colours in autumn. 

A star plant in kitchen gardens, Dahlias are undoubtedly beautiful flowers, they are impeccable in a flower bed, but can also enhance the vegetable garden. In Mexico, this tuberous plant was first cultivated as a root vegetable to be consumed. Its poor taste qualities quickly assigned it the rank of an ornamental plant. 

Dahlia Hemisphere in pictures

Dahlia Hemisphere (Flowering) Flowering

Plant habit

Height at maturity 90 cm
Spread at maturity 60 cm
Growth rate fast

Flowering

Flower colour two-tone
Flowering time July to November
Inflorescence Flower head
Flower size 11 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Dahlia

Cultivar

Hémisphère

Family

Asteraceae

Other common names

Dahlia

Origin

Cultivar or hybrid

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Planting and care

The decorative Dahlia 'Hemisphere' is easy to grow in all regions. For abundant flowering, it is good to follow a few simple rules. Plant the tubers in a sunny location as soon as the last frost has passed. Rich, fresh, and well-drained soil is perfect. However, stagnant moisture would promote tuber rot. Feel free to 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. Your dahlia should be covered with about 6cm (2in) of soil. At the end of the planting, water abundantly once, 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. In November, the first frosts cause the foliage to turn black, which is the time to dig them up. Carefully remove the tubers from the ground, taking off 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 crate on newspaper. Store them in a frost-free, dry, cool, and dark place, such as a non-freezing garage or an attic. In southern regions, close to the coast, where there are only a few days of frost per year, 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 large Dahlia, with its hollow stems, is still sensitive to strong winds or heavy rains. To overcome this drawback, you can stake it, but let's agree, it's not very aesthetically pleasing. On the other hand, by pinching the stems early or removing the axial flower buds, you will spread out the plant's habit, which will offer more resistance to bad weather. At the same time, you channel the sap flow to a single flower, which will become larger and sturdier.

Planting period

Best planting time March to April
Recommended planting time March to May

Intended location

Suitable for Meadow
Type of use Border, Container, Vegetable garden
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Any
Soil moisture Moist soil, Fertile, well-drained.

Care

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

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