Sonata Pink

Cosmos

50d to harvest

Velvety petals unfurl in a luminous wash of soft Sonata Pink, catching the light like spun silk and holding their color with graceful steadiness. At maturity, blooms rise on airy, branching stems with a delicate, feathery texture that makes every bouquet feel light and abundant. Grow Sonata Pink for a long-lasting cut-flower display—ideal for fresh arrangements and for adding a romantic, airy note to garden borders.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 1st
Transplant / Sow Outdoors	Apr 1st
Harvest Begins	May 21st
Harvest Ends	Nov 5th

Crop Details

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

Frequently Asked Questions

How do I prevent and treat powdery mildew on Cosmos bipinnatus (Sonata Pink)?

Powdery mildew on Cosmos bipinnatus shows up as a white, dusty coating on leaves, usually when airflow is poor. Remove the worst leaves early and avoid wetting foliage when watering; water at the base in the morning. If it’s spreading, spray a potassium bicarbonate or horticultural soap product according to label directions and repeat as needed until new growth stays clean.

How often should I water Cosmos bipinnatus during the main growing period?

During the main growth (from emergence through the first flush of blooms), keep the soil evenly moist but not soggy—about 1 inch (2–3 cm) of water per week depending on heat. Let the top 1 inch of soil dry slightly between waterings, because Cosmos bipinnatus is prone to stem issues in constantly wet soil. Once established, you can taper to less frequent watering while maintaining light moisture for continued flowering.

What signs tell me Cosmos bipinnatus (Sonata Pink) is ready to harvest?

Cosmos bipinnatus is ready to harvest about 50 days from sowing, but use the blooms as the real cue. Harvest when flower heads are fully open and the centers look developed (not shrinking back), typically in the morning. For longest vase life, cut stems just above a leaf node and avoid harvesting after heavy rain when petals may bruise easily.