Sensation Mixed

Cosmos

60d to harvest

Feathery, airy blooms arrive in a dazzling spectrum—silk-petaled flowers that seem to glow in warm sunset tones and cool jewel shades. Sensation Mixed cosmos produces long, slender stems with a light, graceful texture, making each planting feel like a living bouquet from the first open bloom. Grow it for abundant cut-flower display and for a garden that stays in motion with color all season long.

Crop Dates

Growing note: In frost-free Zone 11b, grow this cool-season crop during the cooler dry season (October–February).

Milestone	Date
Start Indoors	—
Climate	Frost-Free Climate
Transplant / Sow Outdoors	Oct 1st
Harvest Begins	Nov 30th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Surface
Germination Temp (°F)	70
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease problem commonly affects Cosmos bipinnatus (Cosmos Sensation), and how can I manage it at home?

Cosmos bipinnatus is prone to powdery mildew, especially in humid weather and when plants are crowded. Water at the base to keep foliage dry, space plants so air can circulate, and remove badly affected leaves early. If mildew persists, spray with a garden-safe potassium bicarbonate product and reapply according to label directions.

How often should I water Cosmos bipinnatus during the main growing phase to keep flowering healthy?

During active growth and bud formation, water deeply when the top 1 inch of soil feels dry, typically about 2–3 times per week depending on heat and wind. Cosmos prefers evenly moist soil but not soggy conditions—poor drainage can trigger root problems. Water in the morning so the foliage dries quickly before evening.

How do I tell when Cosmos bipinnatus (Cosmos Sensation) is ready to harvest for cut flowers?

Harvest when the flower heads are fully colored and the central disk florets are open, but before they start turning brown and forming seed. Cut stems early in the morning and choose blooms with sturdy, fresh foliage for the longest vase life. For continuous flowering, remove spent heads promptly so the plant keeps producing new buds.