Heirloom

Cupcakes Blush

Cosmos bipinnatus

Photo: Chris Rycroft from Madison, Wisconsin, United States · Wikimedia Commons · (CC BY 2.0)

Harvest

90-100d

Days to harvest

📅

Sun

Full sun to partial shade

☀️

Zones

2–11

USDA hardiness

🗺️

Height

2-4 feet

📏

Planting Timeline

Zone:

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Start Indoors

Transplant

Direct Sow

Start Indoors

Transplant

Direct Sow

Showing dates for Cupcakes Blush in USDA Zone 7

All Zone 7 flower →

Zone Map

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Cupcakes Blush · Zones 2–11

What grows well in Zone 7? →

Growing Details

Difficulty

Easy

SeasonWarm season annual

ColorLight blush pink

Zone-by-Zone Planting Calendar

Zone	Indoor Start	Transplant	Direct Sow	Harvest
Zone 1	May – June	July – August	July – September	—
Zone 2	April – May	June – July	June – August	—
Zone 11	January – January	January – February	January – March	—
Zone 12	January – January	January – February	January – March	—
Zone 13	January – January	January – February	January – March	—
Zone 3	April – May	June – July	June – August	—
Zone 4	March – April	June – June	June – July	—
Zone 5	March – April	May – June	May – July	—
Zone 6	March – April	May – June	May – July	—
Zone 7	February – March	April – May	April – June	—
Zone 8	February – March	April – May	April – June	—
Zone 9	January – February	March – April	March – May	—
Zone 10	January – January	February – March	February – April	—

Succession Planting

Direct sow every 3-4 weeks from your last frost date through early June to keep fresh flowers coming all season. Cosmos germinates best when soil temps sit between 65-75°F; sow too late into summer heat and germination gets patchy. A single planting will bloom for a long time if you deadhead consistently — clip spent flowers every 4-5 days — so most gardeners find 2-3 successions are plenty rather than a tight 14-day cadence.

In zone 7, a final direct sow in late May to early June delivers a flush of blooms in September and October before frost closes things out. Don't bother with a July sow; at 90-100 days to bloom, the math doesn't work before first frost arrives.

Complete Growing Guide

Cupcakes Blush is as showy as Double Click with lighter-weight blooms held upright on strong stems. The light-colored, finely pleated blooms float above the foliage, reminding us of Degas' paintings of ballerinas. A small percentage of flowers have lovely tufted centers. According to Johnny's Selected Seeds, Cupcakes Blush is 90 - 100 days to maturity, annual, open pollinated. Notable features: Use for Cut Flowers and Bouquets, Attracts Beneficial Insects.

Light: Full sun (6 or more hours of direct sunlight a day), Partial Shade (Direct sunlight only part of the day, 2-6 hours). Soil: Clay, Loam (Silt), Sand. Soil pH: Alkaline (>8.0), Neutral (6.0-8.0). Drainage: Good Drainage, Occasionally Dry. Height: 2 ft. 0 in. - 4 ft. 0 in.. Spread: 2 ft. 0 in. - 3 ft. 0 in.. Spacing: 12 inches-3 feet. Growth rate: Rapid. Maintenance: Low. Propagation: Seed. Regions: Coastal, Mountains, Piedmont.

Harvesting

Cupcakes Blush reaches harvest at 90 - 100 days from sowing per Johnny's Selected Seeds. As an annual, harvest continues until frost ends the season.

Type: Capsule.

Storage & Preservation

For fresh storage, display Cupcakes Blush cut flowers in a clean vase with fresh, cool water (65-72°F) in a cool location away from direct sunlight and ripening fruit. Change water every 2-3 days. Shelf life typically ranges from 7-10 days. To preserve longer, try drying flowers by hanging them upside down in a warm, dark, well-ventilated space for 2-3 weeks—ideal for arrangements. Alternatively, press flowers between absorbent paper under weight for 4-6 weeks for flat preservation in crafts. Glycerin treatment (mixed with water) can also extend vase life and create dried arrangements with retained color and flexibility.

History & Origin

Cupcakes Blush is open-pollinated, meaning seed saved from healthy plants will produce true-to-type offspring. Listed in the Johnny's Selected Seeds catalog.

Origin: Mexico and southwest North America

Advantages

+Elegant, light-colored blooms float gracefully above foliage like ballet dancers.
+Strong stems hold flowers upright without staking or support needed.
+90-100 day maturity provides reliable blooms within a single growing season.
+Easy difficulty level makes Cupcakes Blush perfect for beginning gardeners.
+Some flowers develop charming tufted centers adding unique visual interest.

Considerations

-Lighter petals may bruise or show damage during heavy rain.
-Only a small percentage of flowers display the desirable tufted centers.
-Extended 90-100 day timeline means later planting dates miss peak season.
-Fine pleated petals require deadheading to maintain neat garden appearance.

Companion Plants

Marigolds and sweet alyssum are the most useful neighbors here. Tagetes patula specifically — the French marigold — deters aphids and whiteflies through volatile compounds in its foliage and roots, and it draws predatory wasps that work through caterpillar populations. Sweet alyssum planted at the base of cosmos pulls in hoverflies whose larvae eat aphids by the hundreds. Nasturtiums earn a spot as a trap crop: aphids pile onto them preferentially and leave the cosmos alone, which is a reasonable trade if you're willing to pull the nasturtium colonies once they're heavily infested rather than letting the pest pressure build.

Keep cosmos at least 60 feet from any black walnut (Juglans nigra) — juglone from the roots moves through the soil that far out from the trunk and stunts or kills a wide range of annuals, cosmos included. Fennel is a subtler problem: it produces allelopathic compounds that suppress neighboring plants, and most beneficial insects give fennel a wide berth anyway, which works against everything you're trying to accomplish by planting Cupcakes Blush in the first place.

Plant Together

Marigolds

Repel nematodes, aphids, and whiteflies while attracting beneficial pollinators

Sweet Alyssum

Attracts beneficial insects like hoverflies and parasitic wasps for natural pest control

Nasturtiums

Act as trap crops for aphids and cucumber beetles, drawing pests away from petunias

Lavender

Repels moths, fleas, and mosquitoes while complementing pink blooms aesthetically

Catmint

Deters ants, aphids, and rodents while attracting beneficial pollinators

Zinnia

Attracts butterflies and beneficial insects while providing complementary colors

Parsley

Attracts beneficial insects and provides ground cover without competing for nutrients

Cosmos

Attracts beneficial predatory insects and provides structural support in mixed plantings

Keep Apart

Black Walnut

Produces juglone toxin that causes stunted growth and yellowing in sensitive plants

Eucalyptus

Releases allelopathic compounds that inhibit germination and growth of nearby plants

Fennel

Produces allelopathic chemicals that stunt growth and reduce flowering in most companion plants

Troubleshooting Cupcakes Blush

What you'll see, why it happens, and what to do about it.

Seedlings stretching tall and flopping over before they've grown a second set of true leaves

Likely Causes

Insufficient light — less than 6 hours of direct sun causes etiolation
Starting indoors too early, 8+ weeks before last frost, so plants outgrow their light source

What to Do

1.Move flats to the sunniest south-facing window, or drop grow lights to 2-3 inches above the canopy
2.Start cosmos no more than 4-6 weeks before transplant date — they catch up fast and don't benefit from a long head start
3.Pinch the tallest seedlings back by a third to encourage a stockier stem before transplanting

Powdery white coating on leaves and stems, usually showing up in midsummer after a stretch of humid nights

Likely Causes

Powdery mildew (Erysiphe cichoracearum) — a fungal disease that thrives when humidity is high but foliage stays dry
Crowded planting with poor airflow between plants

What to Do

1.Space plants at least 12-18 inches apart so air moves through the canopy
2.Remove and trash (don't compost) the worst-affected stems — don't bother trying to save fully coated foliage
3.Apply a diluted neem oil spray (2 tablespoons per gallon of water) every 7 days on remaining healthy growth as a preventive

Flower buds forming but refusing to open, or opening partially and then browning at the edges

Likely Causes

Botrytis blight (Botrytis cinerea) — a gray mold that attacks soft tissue during cool, wet spells
Prolonged overcast weather keeping petals damp for more than 24 hours

What to Do

1.Cut affected buds off cleanly and dispose of them — leaving them on the plant gives the fungus more material to spread from
2.Improve drainage if the bed stays wet; cosmos do not want wet feet, even briefly
3.If gray fuzzy spores are visible, treat surrounding plants with a copper-based fungicide per label rates

Leaves with irregular chewed holes, or entire young stems cut off at soil level overnight

Likely Causes

Caterpillars — particularly corn earworm (Helicoverpa zea) or variegated cutworm (Peridroma saucia) feeding at night
Cutworms specifically target young transplants in the first 2 weeks after going in the ground

What to Do

1.Press a 3-inch cardboard collar 1 inch into the soil around each transplant stem to block cutworm access
2.Hand-pick caterpillars off foliage after dark with a flashlight — they're easy to spot and slow-moving
3.Apply Bacillus thuringiensis (Bt) spray to foliage if pressure is heavy; it's effective and won't harm pollinators visiting the flowers

Frequently Asked Questions

How long do Cupcakes Blush flowers last in a vase?▼

Cupcakes Blush flowers typically last 7-10 days when placed in fresh, cool water and changed every 2-3 days. Keep them away from direct sunlight, heat, and ripening fruit to extend their lifespan. Removing lower leaves and recutting stems at an angle daily helps maximize freshness and vase life.

Is Cupcakes Blush a good variety for beginners?▼

Yes, Cupcakes Blush is excellent for beginners. It's rated as an easy-to-grow heirloom variety that produces showy, long-lasting blooms on strong stems. The flowers bloom reliably within 90-100 days and perform well in various light conditions, making it forgiving and rewarding for novice gardeners.

Can you grow Cupcakes Blush flowers in containers?▼

Yes, Cupcakes Blush can be grown in containers. Use well-draining potting soil and ensure containers are at least 12-18 inches deep to accommodate root development. Place containers in full sun to partial shade and water regularly. Container-grown plants may require more frequent watering and occasional fertilizing throughout the growing season.

When should I plant Cupcakes Blush seeds?▼

Start Cupcakes Blush seeds indoors 6-8 weeks before your last spring frost, or direct sow after the last frost date when soil has warmed. This heirloom variety needs the full 90-100 days to reach harvest maturity. In mild climates, you can succession-plant every 2-3 weeks for continuous blooms throughout the season.

What makes Cupcakes Blush different from Double Click flowers?▼

Cupcakes Blush features lighter-weight, finely pleated blooms that float gracefully above foliage on strong stems, compared to Double Click's showier appearance. Cupcakes Blush blooms are more delicate and ethereal, reminiscent of Degas' ballerina paintings, with a small percentage displaying lovely tufted centers, making it unique for a refined aesthetic.

What light conditions does Cupcakes Blush prefer?▼

Cupcakes Blush thrives in full sun to partial shade, requiring 4-6+ hours of direct sunlight daily. While it can tolerate partial shade, best blooms and stem strength occur with ample sunlight. Even in warmer climates, afternoon shade can help preserve flower color and extend bloom duration.