Sensation Dazzler

Cosmos

Zone 2b Save Garden

Botanical illustration of Sensation Dazzler

🌱 70d to harvest Upright

Feathery, sky-light petals unfurl in a dazzling spectrum—silky blooms that shimmer from warm rose-pink to bright magenta with a c…

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 15th
Transplant / Sow Outdoors	May 15th
Harvest Begins	Jul 24th
Harvest Ends	Aug 25th

Crop Details

Trait	Value
Days to Maturity	70
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

Recommended Companions

Taishan Yellow Marigold

Red Gem Marigold

Cut And Come Again Zinnia

Queen Lime Blush Zinnia

Oklahoma Mix Zinnia

Benary's Giant Zinnia

Frequently Asked Questions

What pest or disease problem commonly affects Cosmos bipinnatus, and how can I address it?

Cosmos bipinnatus is especially prone to aphids and leaf-chewing caterpillars, which can cluster on new growth and distort buds. Spray a strong jet of water to knock aphids off, then spot-treat with insecticidal soap if numbers persist; for caterpillars, hand-pick early or use a Bacillus thuringiensis (Bt) spray targeted at foliage. Keep plants spaced for airflow and remove heavily damaged leaves to reduce disease buildup in dense growth.

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

During active growth and bud formation, water deeply when the top 1 inch of soil is dry, typically about 1–2 times per week depending on heat and soil drainage. Cosmos bipinnatus tolerates dry spells better than constant wetness, so avoid daily light watering that keeps the root zone soggy. Water at the soil line rather than overhead to reduce foliar disease risk.

How can I tell when Cosmos bipinnatus is ready to harvest?

For cut flowers, harvest when the flower heads are fully open and the ray florets are flat and vivid, not still in tight bud form. If you want continuous blooms, cut flowers regularly beginning around the first large open blooms (about 70 days to maturity) so the plant keeps producing new stems. Harvest in the morning and remove leaves that would sit below the waterline in your vase.

Feathery, sky-light petals unfurl in a dazzling spectrum—silky blooms that shimmer from warm rose-pink to bright magenta with a crisp, sunlit center. Sensation Dazzler forms airy, upright plants with a delicate, fernlike texture, producing abundant flowers ideal for long-lasting cut arrangements and standout garden color. Grow it for a season of graceful movement and vivid, high-contrast blooms that draw the eye from every angle.

Sowing Tips

Transplant Conditions

Wait until soil reaches 60°F and nights stay above 50°F before moving outdoors.

Expert Note

For best long stems for cutting, thin seedlings after true leaves and keep plants in full sun with minimal nitrogen.