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 |
Beginner
skill rating |
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0.5m
max. spread |
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1m
max. height |
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2-5 years
to maturity |
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1 hour care
per year |
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This plant
is toxic! |
Botanical name: Cosmos atrosanguineus
Other names: Chocolate cosmos, Black cosmos, Black dahlia
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Genus: Cosmos
Species: C. atrosanguineus - C. atrosanguineus is a spreading perennial, with divided leaves and chocolate-scented, dark maroon flowers.
Cosmos atrosanguineus is: Deciduous
Flower: Dark-red, Black in Summer
Foliage: Bright-green in Summer
Fragrance: Chocolate scented
Habit: Bushy, Clump-forming
Toxicity: Not edible.
Cosmos atrosanguineus (Chocolate cosmos) will reach a height of 1m and a spread of 0.5m after 2-5 years.
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Suggested uses: Beds and borders, Flower Arranging, Cottage/Informal, City
Cultivation: Plant in moderately fertile, moist, but well-drained soil in sun.
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| Soil types: |
Chalky, Loamy, Sandy |
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| Soil drainage: |
Well-drained, Moist but well-drained |
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| Soil pH: |
Acid, Alkaline, Neutral |
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| Light: |
Full Sun |
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| Aspect: |
South, West |
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| Exposure: |
Exposed, Sheltered |
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| Hardiness: |
Tender in frost (H3) |
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Discuss Cosmos atrosanguineus (Chocolate cosmos) with other Shoot members.
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Question from
Eleanor Davis
I have 3 plants and all are suffering from a white mildew up the stems. The plants are well spaced out and in between them I have Euphorbia (Diamond Frost) but I've kept them all quite well spaced to allow for air. How can I treat this or do I need to destroy the plants. I had planned on taking cuttings but that looks unlikely now.
Images -
1. The white mildew on the stems.
2. This brown marking is on the back on some leaves.
3. From above to see the spacing.
I keep the ground clear of leaves and weeds.
Any help would be appricated.
Click to enlarge images
- Views: 212
- Replies: 2
- Posted: Sun. 4th September 2011 18:20
- Last reply: Fri. 30th September 2011 16:46
Comment from
Miriam Mesa-Villalba
Cosmos is a tall tuberous plant, originally from North America. The hummingbird hawk-moth may be the most spectacular insect to be found on cosmos but it may also attract many other nectar feeding insects into a garden, including bees.
- Views: 169
- Replies: 0
- Posted: Wed. 20th May 2009 09:33
We list 27 suppliers who tell us they sell Cosmos atrosanguineus (Chocolate cosmos). In order to see the list you'll need to either register or log in as a full member.
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