Cosmos bipinnatus cvs.

Cosmos bipinnatus cvs.

Photo/Illustration: 
Michelle Gervais
(Cosmos bipinnatus cvs.)
KOZ-mose by-pin-AY-tus
Genus:  Cosmos

Cosmos are branching annuals with ferny foliage and pink, crimson, or white flowers that work well in the back of a border. Although introduced in 1799, cosmos did not beome popular for the garden or as the subject of breeding efforts until the early 1900s. The rest is now history. The variety 'Sensation' won the All-American Selection Award of Merit in 1936 for its clear colors of pink and white, on early-blooming, 3- to 4-foot-tall plants. 'Purity' is the glistening white form of cosmos in the 'Sensation' series. 'Sea Shells' has quilled florets. The Sonata Series cultivars are dwarf plants only growing to about a foot or two tall.

Noteworthy Characteristics: 

Old-fashioned, reliable annual with pretty flowers and ferny foliage. Easy from seed.

Care: 

Full sun and moderately fertile, moist but well-drained soil. Deadhead, but leave a few flowerheads to self-seed if desired. May need staking.

Propagation: 

Sow seed at 61°F in mid-spring, or sow in situ in late spring.

Problems: 

Stem canker, powdery mildew, Rhizoctonia stem rot, and sometimes gray mold, can cause problems. Aphids also occur.

Overview

Height
3 ft. to 6 ft.
Spread
1 ft. to 3 ft.
Growth Habit
Clumps
Growth Pace
Moderate Grower
Light
Full Sun Only
Moisture
Dry to Medium
Maintenance
Moderate
Characteristics
Attracts Butterflies,
Self Seeds,
Showy Flowers,
Showy Foliage
Bloom Time
Early Fall,
Early Summer,
Fall,
Late Summer,
Summer
Flower Color
Greenery
Uses
Beds and Borders,
Cut Flower,
Screening
Style
Cottage Garden
Seasonal Interest
Summer Interest
Type
Annuals

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