Cupcakes White

Cosmos

Zone 6b Save Garden

Botanical illustration of Cupcakes White

🌱 60d to harvest Upright

Delicate as spun lace, Cupcakes White blooms in airy, cloudlike clusters of pristine white petals that glow softly against finely…

Crop Dates

Milestone	Date
Start Indoors	Mar 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jun 24th
Harvest Ends	Oct 16th

Crop Details

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

Recommended Companions

Marigold Marigold

Cut And Come Again Zinnia

Sensation White Cosmos

Inca II Marigold

Zinderella Peach Zinnia

Purity Cosmos

Frequently Asked Questions

What pest or disease commonly affects Cosmos bipinnatus, and how can I manage it at home?

Cosmos bipinnatus is prone to powdery mildew and leaf spotting in humid, crowded conditions. Water the soil (not the foliage), space plants with good airflow, and remove heavily affected leaves early; if it keeps spreading, spray a labeled powdery-mildew fungicide according to the label. Watch also for aphids on new growth and rinse them off with a strong jet of water or use insecticidal soap if needed.

How often should I water Cosmos bipinnatus during active growth?

During the main growing phase, keep the top 1 inch of soil consistently lightly moist, then let it dry slightly between waterings—usually about 1–2 inches of water per week depending on heat and rainfall. Once established, cosmos tolerate brief drought, but prolonged dryness can reduce flowering. In full sun beds, check moisture 2–3 times per week in warm weather and adjust to prevent soggy soil.

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

Harvest flowers when the blossoms are fully open and the ray florets are crisp and brightly colored, typically around 60 days from sowing. For best vase quality, cut stems in the morning and choose blooms that are just opening or fully open—avoid those with wilted petals or browning centers. Continue cutting regularly to encourage more flowering through the season.

Delicate as spun lace, Cupcakes White blooms in airy, cloudlike clusters of pristine white petals that glow softly against finely divided foliage. The flowers open wide and hold their form with a crisp, satiny texture, making a luminous presence in beds and borders from early summer through the first cool days. Grow Cupcakes White for abundant ornamental color—ideal for fresh garden bouquets and long-lasting display.

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

Sow thinly and keep seedlings evenly moist—cosmos germinates best warm and flowers faster in full sun with minimal fertilizer.