Sensation White

Cosmos

Zone 4b Save Garden

Botanical illustration of Sensation White

🌱 60d to harvest Upright

Purest cloud-white blooms with a luminous, velvety center—Sensation White Cosmos turns sunlight into a soft halo from early summe…

Crop Dates

Milestone	Date
Start Indoors	Apr 22nd
Last Frost	May 13th
Transplant / Sow Outdoors	May 20th
Harvest Begins	Jul 19th
Harvest Ends	Sep 27th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	7

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Frequently Asked Questions

What pest or disease commonly affects Cosmos bipinnatus (Sensation White), and what should I do if I see it?

Cosmos bipinnatus is often bothered by aphids, which cluster on tender shoots and can cause leaves to curl and look sticky. Rinse plants with a strong stream of water, then spray insecticidal soap if aphids persist for more than a few days. Keep spacing airy and avoid overhead watering to reduce the chance of fungal issues like powdery mildew as foliage thickens.

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

During active growth and flowering, water deeply about 1–2 times per week, letting the top 1 inch of soil dry between waterings. Cosmos tolerate some drought once established, so avoid keeping the soil constantly wet. If plants wilt in the heat but recover by evening, water thoroughly rather than lightly and frequently.

How can I tell when Cosmos bipinnatus (Sensation White) is ready to harvest?

Harvest for fresh cut flowers when the ray florets are fully open and the center disk is mature but not yet browning. For seed, leave heads on the plant until the flower heads dry and turn tan/brown; then cut when seeds feel firm. At about 60 days from sowing, many plants will be in the first bloom window for cut flowers under full sun.

Purest cloud-white blooms with a luminous, velvety center—Sensation White Cosmos turns sunlight into a soft halo from early summer through the first cool days. Each airy, daisy-like flower carries a crisp, paper-thin petal texture that moves beautifully in the breeze, while the finely divided foliage forms a delicate, fernlike backdrop. Ideal for pollinator-friendly gardens, it shines in mass plantings, borders, and cut-flower displays where its clean color and long-lasting bloom rhythm are the main attraction.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 50°F before moving outdoors. Harden off for 7 days first.

Expert Note

For the longest bloom, thin/space seedlings well and avoid excess nitrogen—cosmos flower best in moderately fertile soil.