Cosmos x Dahlia Mexican Star
Cosmos x Dahlia Mexican Star
Cosmos x Dahlia Mexican Star
Cosmos x Dahlia Mexican Star
Cosmos x Dahlia Mexican Star
Cosmos - Dahlia Hybrid
The bulb arrived in pieces and was broken. One piece is starting to sprout, and I have put all of them in damp sphagnum to encourage more sprouts before planting. I can't see any growing points on the other pieces, but just in case I'm surprised, I will give them an opportunity to show their viability.
Erik, 02/06/2023
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Description
Cosmos x Dahlia 'Mexican Black' is a rather curious tuberous plant, apparently discovered in a wild area in Mexico. 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 unique plant produces single, slightly scented flowers, 6cm (2in) in diameter. They are made up of a collar of dark purple-brown petals surrounding a beautiful golden yellow centre. They bloom in late summer and autumn, above an elegant mound of dark green foliage. It is not very hardy, so it should be grown like a dahlia, in full sun and in light soil.
Cosmos x Dahlia 'Mexican Black' is an herbaceous tuberous plant that belongs to the Asteraceae family. It resembles a dahlia more than a cosmos, both in the scent of its foliage and its mode of growth. Primarily obtained through vegetative propagation, it develops from a frost-sensitive fleshy tuber. From spring, it quickly forms a clump of foliage measuring 40 to 50cm (16 to 20in) in all directions, and 70 to 80cm (28 to 32in) when in flower. The foliage is cut into narrow lobes, and somewhat resembles that of peonies. It is composed 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 last until October if faded flowers are regularly removed. The flowers are grouped in heads and consist of slightly wrinkled ligulate florets on the periphery. They are dark purple-brown with a heart of golden yellow tubular florets. These heads emit a slight chocolatey aroma, especially in warm weather. According to molecular studies conducted in 2012, the dark colour of the heads cannot be attributed to a cross-breeding with Cosmos atrosanguineus, as it is found in at least 14 cultivars of dahlias.
Cosmos x Dahlia 'Mexican Black' is a relatively rare variety. It will not go unnoticed! It is sublime when paired with grey and silver foliage. It will wonderfully accompany artemisias, lamb's ears, or Cineraria maritima in flower beds or pots. The warm tone of its flowers brings out pastel colours, like the pink or blue of asters, or the azure of 'Indigo Spires' sage. It stands out nicely against the acidic green foliage of bipinnate cosmos or Alchemilla mollis.
Cosmos x Dahlia Mexican Star in pictures
Plant habit
Flowering
Foliage
Botanical data
Cosmos x Dahlia
Mexican Star
Asteraceae
Cosmos - Dahlia Hybrid
Cultivar or hybrid
Planting and care
Plant in spring, once the frosts have passed. Plant in light, humus-rich and well-drained soil. It prefers sunny situations, which will better reveal 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 winter 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 new blooms.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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