Cupcakes Blush

Cosmos

60d to harvest

Delicate petals unfurl in a soft blush haze, as if each bloom were dusted with pale rose light—Cupcakes Blush brings a refined, cloudlike presence to the garden from early summer through fall. The flowers are compact and abundant, with a charming, cupcake-like fullness and a silky, satin feel at close range. Grow for nonstop ornamental color in beds, borders, and containers, and let these airy cosmos blooms become the season’s most graceful focal point.

Crop Dates

Growing note: In frost-free Zone 11b, 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)	60
Min Night Temp (°F)	50
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease is most common on Cosmos bipinnatus, and how do I treat it?

Cosmos bipinnatus commonly suffers from powdery mildew when nights are cool and days stay humid, showing up as a white, dusty coating on leaves. Remove the worst leaves, improve airflow by spacing plants, and water at the soil line rather than overhead; if it’s spreading, spray an approved sulfur or potassium bicarbonate product labeled for powdery mildew on ornamentals. Keep an eye out for aphids on tender growth and knock them off with a strong water spray, then spot-treat if needed.

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

During active growth (after seedlings establish), water deeply about 1–2 times per week, aiming to keep soil evenly moist but not soggy. Let the top 1 inch of soil dry between waterings; cosmos in wet, heavy soil is more prone to fungal issues and produces fewer sturdy stems. In full sun beds, adjust frequency upward in hot spells and downward in cool, rainy weeks.

How can I tell when Cosmos bipinnatus ‘Cupcakes Blush’ is ready to harvest?

Harvest flowers when the petals are fully expanded and the center disk is still fresh and not dried or collapsing, which is typically around 60 days from sowing. For best vase life, cut blooms in the morning and use clean pruners to take stems just above a node to encourage more branching. If you want seed, leave a few spent flowers until the seed heads turn dry and tan-brown before collecting.