Genus: Cosmos

Cosmos

Photo/Illustration: 
Susan Roth
(Cosmos)
KOZ-mose
Asteraceae
Typical for Cosmos are cup or bowl-shaped flowers in colorful shades of orange, pink, red, white, and maroon. They are ideal for a cutting garden, mixed border, or annual border. The copious flowers are set atop stiff stems and thread-like foliage.
Noteworthy characteristics:  These plants are found in scrub and meadows of the southern U.S. and Central America. They are loved by butterflies, and make excellent cut flowers. The plants are moderately drought and heat tolerant.
Care:  Grow in moderately fertile, moist but well-drained soil in full sun. Deadhead to prolong flowering, and also leave some seeds to self sow. In cold climates, lift the tubers of tender perennial species and store in a frost-free location. 
Propagation: 

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

Species, varieties and clutivars for genus Cosmos

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Chocolate cosmos
Cosmos atrosanguineus
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Cosmos bipinnatus 'Sea Shells'
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Cosmos bipinnatus 'Sensation Series'
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Cosmos bipinnatus 'Sonata Dwarf Mix'
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Cosmos bipinnatus cvs.
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Cosmos sulfureus 'Cosmic Red'
Problems: 

Stem canker, powdery mildew, Rhizoctonia stem rot, gray mold, aphids.