Chocolate Cosmos
Cosmos atrosanguineus 'Black Magic'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun, Partial Sun
Zones
7, 8, 9
Water
Moderate
Humidity
Average
Lifespan
Tender perennial
Native To
Mexico
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
A unique dark reddish-brown flower with a bushy, upright habit. Known for its striking, dark velvety flowers that have a distinct chocolate-vanilla fragrance.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
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Planting
How to Grow
- Tuck seeds 1/4 inch deep into well-draining soil in spring.
- Mist cuttings to keep soil moist, avoiding overwatering.
- Allow seedlings to grow until they reach 6 inches, then thin out.
- Transplant young plants after last frost for best results.
- Water regularly, especially during dry spells, for vibrant blooms.
- Deadhead spent flowers to encourage continuous flowering.
Pro Tip
Plant in full sun for the most prolific, dark-colored blooms and vigorous growth.
Keep It Thriving
Care Guide
Do
- Water deeply once a week 🌱
- Deadhead regularly to promote more flowers
- Use well-draining soil to prevent root rot
- Provide full sun for optimal growth
Don't
- Avoid overwatering in humid conditions ❌
- Don’t fertilize excessively, as it can reduce flower color
- Steer clear of shady spots, which hinder flowering
- Don’t disturb roots during peak flowering
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Lift Store | ||||||||||||
| Plant | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Chocolate Cosmos questions
What zones can Chocolate Cosmos grow in?
Chocolate Cosmos is hardy in USDA Zones 7–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Chocolate Cosmos deer resistant?
Yes — Chocolate Cosmos is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Chocolate Cosmos bloom?
Chocolate Cosmos typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Chocolate Cosmos need full sun?
Chocolate Cosmos does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Chocolate Cosmos drought tolerant?
Yes — once established (usually after the first full season), Chocolate Cosmos handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.
More Cosmos to compare
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Cosmos bipinnatus 'Fizzy Pink'
Apricot Lemonade Cosmos
Cosmos bipinnatus 'Apricot Lemonade'
Klondike Cosmos Yellow Cosmos
Cosmos sulphureus 'Klondike Cosmos'
Cosmos Versailles White
Cosmos bipinnatus 'Versailles White'
Fizzy White Cosmos
Cosmos bipinnatus 'Fizzy White'
Xsenia Cosmos
Cosmos bipinnatus 'Xsenia'
Keep exploring
Explore the genus
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Hardy in your zone?
Grow Chocolate Cosmos with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.
