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Cosmos x Dahlia Mexican Black

Cosmos x Dahlia Mexican Black
Cosmos - Dahlia Hybrid

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More information

This curious tuberous plant is a hybrid between Cosmos atrosanguineus and Dahlia, offering single flowers, 6 cm (2in) in diameter, made of a collar of dark purple-brown petals surrounding a beautiful golden yellow centre. This bushy plant, 75 cm (30in) tall when in bloom, also develops a mound of divided, dark green foliage. To be cultivated like a Dahlia.
Flower size
6 cm
Height at maturity
70 cm
Spread at maturity
50 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -4°C
Soil moisture
Moist soil
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Best planting time April to May
Recommended planting time March to May
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Flowering time August to October
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Description

The Cosmos x Dahlia Mexican Black is a curious tuberous plant, apparently harvested in Mexico, in a wild area. It is said to be the result of a cross-breeding between Cosmos atrosanguineus and Dahlia coccinea, with which it shares various morphological traits. This rare and original plant produces single, slightly fragrant flowers, 6 cm (2in) in diameter, made of a dark brown-purple collar of petals surrounding a beautiful golden yellow center. They bloom in late summer and autumn, above an elegant mound of dark green foliage. Not very hardy, it should be cultivated like a Dahlia, in full sun and in light soil.

 

The Cosmos x Dahlia Mexican Black is a herbaceous plant with tubers that is quite enigmatic, belonging to the aster family. It resembles more a Dahlia than a cosmos, by the smell of its foliage and its mode of growth. Mainly obtained through vegetative propagation, it develops from a fleshy tuber sensitive to frost and quickly forms a clump of  40 to 50 cm (16 to 20in) in all directions for the foliage, 70 to 80 cm (28 to 32in) for the flowers. The foliage, with few lobes, cut into narrow lobes, somewhat resembles that of peonies. It consists of dark green leaves, slightly tinged with a dull purple, and remains low. The floral stems, tinged with purple-brown, appear in August-September, and until October if faded flowers are regularly removed. The flowers, grouped in heads, consist of slightly crumpled ligulate florets of brownish-purple colour on the periphery and a heart of tubular florets of golden yellow. These heads give off a slight chocolate aroma, especially in hot weather. According to recent molecular studies conducted in 2012, the dark color of the heads is not attributable to cross-breeding with Cosmos atrosanguineus, as it is found in at least 14 Dahlia cultivars.

 

The Cosmos (x) Dahlia Mexican Black is a little-known variety in France, an accent plant that will not go unnoticed in the ornamental garden at the end of the season. It is sublime when paired with gray and silver foliage. In beds or in pots, it will wonderfully accompany artemisias, bear's ears, or sea cineraria. The warm tone of its flowers enhances pastel colours like the pink or blue of asters or the azure of 'Indigo Spires' sage. It stands out against the acidic green foliage of bipinnate cosmos or Alchemilla mollis.

Flowering

Flower colour red
Flowering time August to October
Inflorescence Flower head
Flower size 6 cm
Fragrance slightly scented, Cacao
Flowering description The flowers are grouped in solitary heads measuring 6 cm (2in) in diameter. The capitule is the typical inflorescence of the asteraceae, it simulates a corolla which instead of being composed of simple petals, actually corresponds to ligulate female flowers, and in the center the "false stamen heart" corresponds to a multitude of hermaphrodite tubular flowers.

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 70 cm
Spread at maturity 50 cm
Growth rate normal

Botanical data

Genus

Cosmos x Dahlia

Cultivar

Mexican Black

Family

Asteraceae

Other common names

Cosmos - Dahlia Hybrid

Origin

Cultivar or hybrid

Product reference823231

Other Dahlias

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From 6,90 € 2L/3L pot

Planting and care

Plant Cosmos x Dahlia Mexican Black in spring, once the frosts have passed, in a light, humus-rich and well-drained soil. It prefers sunny positions, which will enhance its fragrance, but tolerates partial shade. Once well established, it withstands drought and heat. It can be grown like a Dahlia, by lifting the tubers before the frosts and storing them in a cool place. It also performs very well in pots. This cultivation method allows the pots to be stored during the winter season in a cool and bright place. Under these conditions, it will flower for a good part of the year. Regularly remove faded flowers to encourage flowering renewal.

16
14,50 € Each

Planting period

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

Intended location

Suitable for Meadow
Type of use Border, Container, Conservatory
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Amateur
Planting density 4 per m2
Exposure Sun, Partial shade
Soil pH Any
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, draining, humus-bearing

Care

Pruning instructions Remove faded flowers regularly to encourage the renewal of flowering.
Pruning Pruning recommended once a year
Pruning time August to September
Disease resistance Very good
Overwinter Needs to be stored

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