Sonata Mix

Cosmos

60d to harvest

Feathery, airy blooms open like living confetti—silky petals in a joyful mix of warm sunset pinks, rosy reds, and sunlit golds, each flower held on sturdy stems for a long, graceful display. Sonata Mix forms a tidy, upright plant with fine, fernlike foliage that makes every blossom look even more luminous. Ideal for fresh cut arrangements and vibrant garden borders, it’s a pollinator favorite that brings constant color from early summer into fall.

Crop Dates

Growing note: In frost-free Zone 11a, 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)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease most commonly affects Cosmos bipinnatus, and how can I control it?

Cosmos bipinnatus is frequently troubled by aphids and by powdery mildew in humid spells. Check the undersides of leaves weekly and spray a strong jet of water or use insecticidal soap when you first see colonies; remove heavily mildewed leaves early to slow spread. Ensure full-sun airflow and avoid overhead watering so the foliage dries quickly.

How often should I water Cosmos bipinnatus during the main growing phase (after it establishes)?

Water to keep the soil evenly moist for the first week or two after germination, then shift to deep, less-frequent watering. During active growth, water about 1–2 times per week depending on heat, aiming for soil that’s slightly dry on top but not bone-dry underneath. In full sun, avoid daily shallow watering—Cosmos performs best when roots are encouraged to reach deeper moisture.

How do I know when Cosmos bipinnatus (Sonata Mix) is ready to harvest for cut flowers?

Harvest when the flower heads are fully open and brightly colored, with the center disk floret area clearly visible. Because Cosmos bipinnatus matures in about 60 days, begin cutting regularly once the first main blooms open, and continue harvesting every few days to trigger more branching and new buds. Cut in the morning and trim stems so they’re ready for a vase immediately.