Sensation Pinkie

Cosmos

60d to harvest

A blush of sensation—Sensation Pinkie Cosmos opens into velvety, petal-soft blooms in vivid pink that seem to glow against airy, ferny foliage. Each flower carries a crisp, button-bright center and a light, feathery texture that moves beautifully in the breeze, making it as delightful in the garden as it is in bouquets. Grow it for long-lasting color and pollinator visits, with blooms arriving in about 60 days and continuing through the season.

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	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	55
Min Night Temp (°F)	40
Harden Off (days)	Not Required

Frequently Asked Questions

What disease is most common on Cosmos bipinnatus and what should I do if I see it?

A common problem for Cosmos bipinnatus is powdery mildew, which shows up as a white, floury coating on leaves and can stunt growth if it spreads. Improve airflow by thinning plants to about 12–18 in (30–45 cm) apart, water at the soil line (not on the foliage), and remove heavily affected leaves. If it persists, spray a potassium bicarbonate or horticultural soap treatment according to label directions, starting at the first signs.

How often should I water Cosmos bipinnatus during its main growing phase?

During the main growth period, keep soil lightly moist but never soggy—water when the top 1 in (2–3 cm) of soil feels dry. Give a deep watering so moisture reaches the root zone, especially in hot weather, typically about 1–2 times per week depending on rainfall and container size. Once plants are established, they tolerate short dry spells, but continuous dryness reduces flower size.

How can I tell when Cosmos bipinnatus ‘Sensation Pinkie’ is ready to harvest for cut flowers?

Harvest when the buds are well-formed and just starting to show color, before the florets fully open—this extends vase life. For peak blooms, look for sturdy stems with strong side buds and pick flowers regularly (every few days) to keep plants producing. With typical 60 days to maturity, start checking from about day 50 as soon as plants are forming multiple flower heads.