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Cosmos 'Purity'

Cosmos bipinnatus


Cosmos bipinnatus 'Purity' bears masses of pure white, single, saucer-shaped flowers, in contrast with bright green, feathery foliage.

Pure white. A classic summer flower having large 4" to 6" blooms on 3 ft. to 4 ft. tall stems. The foliage is finely cut, and the plants branch out and bloom profusely and continually.

Cosmos attract birds, bees and butterflies and are rarely bothered by pests or disease.


Wonderful cut flower for wedding work, bridal bouquet


Plant Life Cycle: annual

Site:Full sun
Height: 36-48”
Days to maturity: 75-90 days

Seed depth:1/8"
Plant spacing: 12”
Pinch: when 12” tall
Approx seeds per packet: 50


How to Grow:

Starting Indoors: Start indoors 4-6 weeks before the last frost. Provide 70-75 ºF soil temperature. Transplant after the last frost,12-18” apart.Sowing Outdoors: Direct sow outdoors after the last frost, sow a few seeds every 6", thin 12-18" apart.Growth Habit: Upright, branchingHeight and Width: 36-48” by 24-36”

Care: Deadheading prolongs flowering, staking tall plants helps keep them upright when the plant is full of blooms. Self-seeds

Tip to bring your cosmos plants into bloom up to 3 weeks earlier when growing under fluorescent lights: once seedlings have emerged provide 11 hours per day of artificial light. Keep seedlings in complete darkness for the remaining 13 hours. After 2 weeks, keep the lights on for 14 or more hours per day.



Deadhead and cut for bouquets regularly to extend the bloom period.Harvest when buds are just begins to open, but haven’t fully opened 


Vase life:

4-9 days with Flower preservative 

Cosmos 'Purity'

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