Cosmos atrosanguineus Chocamocha
Cosmos atrosanguineus Chocamocha
Cosmos atrosanguineus Chocamocha
Cosmos atrosanguineus Chocamocha
Cosmos atrosanguineus Chocamocha
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Sandra B.
Cosmos atrosanguineus Chocamocha
Sandra B. • 64 FR
Cosmos atrosanguineus Chocamocha
Cosmos atrosanguineus Chocamocha 'Thomocha'
Chocolate Cosmos
Beautiful vigorous plant, but disappointment when the buds opened: flowers far too small, 3 cm at the very most :-/ I must have missed something...
slanterne , 21/10/2025
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Description
Cosmos atrosanguineus 'Chocamocha' is a unique variety that resembles a chocolate plant. Its delicate flowers are a combination of brown hues and purple reflections that look like silk and velvet. During hot weather, it exudes a pleasant aroma of vanilla and chocolate that is stronger than that of the wild plant from which it originates. This particular cosmos is very compact and has different foliage, which makes it stand out from the others. Although it is often considered an annual, it is actually a perennial plant that is vulnerable to frost but can withstand heat and drought. It can be grown in a manner similar to that of a Dahlia. It grows best in light, humus-rich, moist to dry soils, in full sun or partial shade. It is ideal for flowering pots or for planting at the front of borders.
The Cosmos atrosanguineus plant belongs to the Aster family and is native to Mexico. Unlike other plants, it cannot produce viable seeds and is mainly propagated through division of tubers. It looks more like a Dahlia than a cosmos. The closely related 'Choca Mocha' variety is also primarily propagated vegetatively. It grows from a fleshy tuber which is sensitive to frost and quickly forms a clump of 40 cm (15.7 in) in all directions starting from spring. The foliage is slightly lobed and somewhat resembles that of peonies. It is composed of glaucous green leaves that are slightly tinged with dull violet. The plant remains low. The floral stems appear from June to October, provided that faded flowers are regularly removed. The flowers are grouped in heads consisting of ligulate florets with a brownish-purple colour on the periphery and a dark heart of tubular florets. These heads are highly fragrant, especially in hot weather. This variety produces few, if any, viable seeds.
The Cosmos atrosanguineus 'Choca Mocha' is a stunning plant that pairs well with grey and silver foliage. Whether in borders or containers, it will complement other plants such as Artemisias, Bear's Ears or Silver Ragwort. Its warm-toned flowers will beautifully brighten up pastel colours like the pink or blue of annual poppies or the azure of the blue thistle. The plant will stand out against the acidic green foliage of bipinnate cosmos and Alchemilla mollis.
Please note that our plug plants are professional products intended for experienced gardeners. Upon receiving them, it's important to transplant them and store them under cover (veranda, greenhouse, cold frame, etc.) at a temperature above 14°C for a few weeks before planting them outdoors once the risk of frost has definitively passed.
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Cosmos atrosanguineus Chocamocha in pictures
Flowering
Foliage
Plant habit
Botanical data
Cosmos
atrosanguineus
Chocamocha 'Thomocha'
Asteraceae
Chocolate Cosmos
Cultivar or hybrid
Planting and care
To plant the Cosmos atrosanguineus 'ChocaMocha', wait until spring once the frost has passed, and choose a well-drained soil that is light and rich in humus. It thrives in sunny locations, which will bring out the full intensity of its fragrance, but it can also tolerate partial shade. Once it's well-established, it can withstand drought and heat. You can cultivate it like a Dahlia by removing the tubers before the frost and storing them in a cool place. It also does well in pots, which can be stored in a cool and bright location during the winter. This allows it to flower for a good part of the year. To encourage more flowers, deadhead regularly.
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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