Psyche White

Family: Asteraceae Flower

Planting Schedule

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Silken, cloudlike blooms open in a luminous wash of pure white, each daisy face edged with a crisp ring that catches the light like fine porcelain.

Psyche White forms airy, upright stems with feathery foliage that moves in the breeze, creating a fresh, weightless texture in the garden. Grow it for long-lasting cut-flower bouquets and for bright, breezy drifts of white in borders where its daisy-like presence stays picture-perfect from early summer through fall.

Light: Full SunMaturity: 70 DaysHabit: Upright

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Psyche White Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Apr 27th	May 25th	Aug 3rd – Aug 29th
Zone 2b	Apr 17th	May 15th	Jul 24th – Aug 25th
Zone 3a	Apr 17th	May 15th	Jul 24th – Sep 1st
Zone 3b	Apr 21st	May 19th	Jul 28th – Sep 21st
Zone 4a	Apr 17th	May 15th	Jul 24th – Sep 24th
Zone 4b	Apr 15th	May 13th	Jul 22nd – Sep 27th
Zone 5a	Apr 10th	May 8th	Jul 17th – Sep 30th
Zone 5b	Apr 6th	May 4th	Jul 13th – Oct 5th
Zone 6a	Apr 3rd	May 1st	Jul 10th – Oct 10th
Zone 6b	Mar 28th	Apr 25th	Jul 4th – Oct 16th
Zone 7a	Mar 23rd	Apr 20th	Jun 29th – Oct 20th
Zone 7b	Mar 13th	Apr 10th	Jun 19th – Oct 28th
Zone 8a	Mar 4th	Apr 1st	Jun 10th – Nov 5th
Zone 8b	Feb 23rd	Mar 23rd	Jun 1st – Nov 12th
Zone 9a	Feb 6th	Mar 6th	May 15th – Nov 26th
Zone 9b	Jan 12th	Feb 9th	Apr 20th – Dec 9th
Zone 10a	—	Oct 1st	Dec 10th – Feb 28th
Zone 10b	—	Oct 1st	Dec 10th – Feb 28th
Zone 11a	—	Oct 1st	Dec 10th – Feb 28th
Zone 11b	—	Oct 1st	Dec 10th – Feb 28th
Zone 12a	—	Oct 1st	Dec 10th – Feb 28th
Zone 12b	—	Oct 1st	Dec 10th – Feb 28th
Zone 13a	—	Oct 1st	Dec 10th – Feb 28th
Zone 13b	—	Oct 1st	Dec 10th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	70
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)	40
Harden Off (days)	7

Culinary Notes

Chef's Note

Even though they’re showy, these white cosmos blooms read more like a crisp, faintly floral garnish than a heavy flavor ingredient—best kept cold and restrained so they don’t go woolly or get lost. Treat them like edible confetti: one or two per plate, paired with acid and clean fats so the porcelain-ring bite shows up.

Best Uses

use as a chilled garnish on citrusy seafood and crudo
toss sparingly into bright salads to add a clean, snappy edge
float over soups or chilled broths for a quick visual pop

Flavor Profile

lightly vegetal subtly floral crisp, daisy-like bite

Kitchen Pairings

lemon olive oil sea salt white fish goat cheese

Frequently Asked Questions

What’s the most common pest or disease on Cosmos bipinnatus (Asteraceae) and how can I treat it at home?

Cosmos bipinnatus commonly gets powdery mildew, especially in humid weather or when plants are crowded. Water at the soil line (not the foliage), thin seedlings so leaves dry quickly, and remove heavily affected leaves early. If mildew appears, spray a labeled horticultural sulfur or potassium bicarbonate product per the label, repeating as directed because cosmos growth continues for about 70 days.

How often should I water Cosmos bipinnatus during active growth?

During the main growing phase, keep the soil consistently moist but not soggy—aim for watering about 1–2 times per week depending on heat, with deeper soakings rather than frequent light sprinkles. Let the top 1–2 inches of soil dry slightly between waterings to prevent stress and reduce mildew risk. Once plants are established and flowering, continue regular moisture; drought-stressed cosmos often makes smaller blooms and can slow flower production.

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

Harvest when the flower heads are fully formed and the ray petals are open and crisp, typically around 60–70 days after sowing. Cut in the morning, snipping stems just above a leaf node to encourage side branching and additional blooms. If you’re saving seed, leave heads on the plant until they turn dry and brown and the seeds release easily from the center.