1 named cultivar
The Story
Plant Bio
Cosmos atrosanguineus, commonly known as Chocolate Cosmos, is a perennial herbaceous plant distinguished by its dark, chocolate-brown flowers and finely divided, fern-like foliage, offering a striking contrast in garden borders.
This species is renowned for its intensely fragrant, deep crimson to dark brown flowers that have a distinct chocolate scent, adding a rich, aromatic element to gardens and attracting pollinators.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
24 inches
Width
18 inches
Light
Full Sun
Zones
7, 8, 9, 10
Water
Low to moderate
Humidity
Average
Lifespan
Perennial
Native To
Mexico
Toxicity
Non-toxic to humans and pets
Planting
How to Grow
- Tuck seeds shallowly into well-draining soil in spring.
- Mist cuttings if propagating via softwood cuttings in early summer.
- Ensure full sun exposure for optimal blooming.
- Water regularly until established, then reduce watering.
- Fertilize monthly during active growth with balanced fertilizer.
- Pinch back dead or damaged stems to encourage bushier growth.
Pro Tip
Use well-draining soil and full sun for best blooms.
Keep It Thriving
Care Guide
Do
- Water deeply but infrequently to prevent root rot 🌱
- Deadhead spent flowers to promote more blooms
- Apply a balanced fertilizer monthly during growing season
- Mulch around plants to retain moisture
Don't
- Overwater, which can cause root rot ❌
- Plant in heavy clay soil without amendments
- Neglect deadheading, reducing flowering
- Expose to too much shade
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Lift Store | ||||||||||||
| Plant | ||||||||||||
| Stake |
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 (6+ hours).
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
Fizzy Pink Cosmos
Cosmos bipinnatus 'Fizzy Pink'
Apricot Lemonade Cosmos
Cosmos bipinnatus 'Apricot Lemonade'
Fizzy White Cosmos
Cosmos bipinnatus 'Fizzy White'
Klondike Cosmos Yellow Cosmos
Cosmos sulphureus 'Klondike Cosmos'
Cosmos Versailles White
Cosmos bipinnatus 'Versailles White'
Xsenia Cosmos
Cosmos bipinnatus 'Xsenia'
Keep exploring
Explore the genus
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.