Klondike Cosmos Yellow Cosmos
Cosmos sulphureus 'Klondike Cosmos'
Not currently listed at our partner nurseries.
Essentials
At a Glance
Plant Type
Annual
Height
24 inches
Width
12 inches
Light
Full Sun, Partial Sun
Zones
5, 6, 7, 8, 9
Water
Moderate
Humidity
Average
Lifespan
Annual
Native To
Americas
Toxicity
Non-toxic to humans and pets
The Story
Plant Bio
Klondike Cosmos features vibrant yellow flowers that bloom abundantly. This cultivar is notable for its compact growth habit and continuous blooming throughout the summer.
Bloom Period:
Uses & Benefits:
Marketplace
Where to Buy
We couldn't find this plant listed online right now.
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Tuck seeds into well-draining soil in early spring for best germination.
- Mist cuttings lightly to maintain moisture and promote root growth.
- Water regularly, keeping soil moist but not waterlogged.
- Fertilize monthly with a balanced, water-soluble fertilizer during growing season.
- Prune dead or damaged stems to encourage bushier growth.
- Mulch around plants to retain moisture and suppress weeds.
Pro Tip
Sow seeds directly in the garden after the last frost for vibrant summer blooms.
Keep It Thriving
Care Guide
Do
- Water consistently during dry spells 🌱
- Deadhead spent flowers to encourage more blooms
- Provide full sun for optimal flowering
Don't
- Avoid overwatering to prevent root rot ❌
- Don’t fertilize late in the season to prevent legginess
- Never plant in heavy, poorly-drained clay soil
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Deadhead | ||||||||||||
| Fertilize | ||||||||||||
| Plant |
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
Klondike Cosmos Yellow Cosmos questions
What zones can Klondike Cosmos Yellow Cosmos grow in?
Klondike Cosmos Yellow Cosmos is hardy in USDA Zones 5–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Klondike Cosmos Yellow Cosmos deer resistant?
Yes — Klondike Cosmos Yellow Cosmos is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Klondike Cosmos Yellow Cosmos bloom?
Klondike Cosmos Yellow 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 Klondike Cosmos Yellow Cosmos need full sun?
Klondike Cosmos Yellow Cosmos does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.
Is Klondike Cosmos Yellow Cosmos drought tolerant?
Yes — once established (usually after the first full season), Klondike Cosmos Yellow 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'
Cosmos Versailles White
Cosmos bipinnatus 'Versailles White'
Fizzy White Cosmos
Cosmos bipinnatus 'Fizzy White'
Xsenia Cosmos
Cosmos bipinnatus 'Xsenia'
Cosmos Cosimo Purple Red-White
Cosmos bipinnatus 'Cosimo Purple Red-White'
Keep exploring
Explore the genus
Collections featuring this plant
Hardy in your zone?
Grow Klondike Cosmos Yellow 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.
