Dazzler

Cosmos

55d to harvest

Dazzler Cosmos blooms with a radiant, candy-bright presence—silky petals that catch the light like spun satin and a warm, inviting center that seems to glow from within. Expect airy, feathery foliage and long, sturdy stems that hold their poise from bud to full bloom, making this variety a standout for fresh arrangements and garden display. With its pollinator-attracting charm and dependable 55-day timeline, Dazzler is a joy to grow for color that feels effortless and abundant.

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 25th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	55
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

Frequently Asked Questions

What pest or disease most commonly affects Cosmos bipinnatus (Dazzler), and how do I control it?

Cosmos bipinnatus is especially prone to aphids and, in wet spells, powdery mildew. Spray affected plants with a strong jet of water to knock off aphids, then repeat every 2–3 days for a week; for mildew, improve airflow by thinning crowded growth and avoid wetting foliage when you water (early morning only). If mildew persists on new growth, use a labeled garden fungicide and remove heavily infected leaves.

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

During active growth (roughly from when seedlings establish until flowering), water deeply about 1–2 times per week so the top 1–2 inches of soil dry slightly between waterings. Cosmos bipinnatus tolerates some drought once established, so don’t keep the soil constantly wet—aim for even moisture, not soggy conditions. In hot weather, check more frequently, but still let the top layer dry before the next deep watering.

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

Harvest for cut flowers when the flower heads are fully open and the petals are flat and vibrant, not still tightly closed. For seed harvest, wait until the flower head turns brown and dry and the individual seeds are firm before cutting the heads. Cosmos bipinnatus typically reaches maturity in about 55 days, so use that timing as a baseline and confirm by the flower’s stage.