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Cosmos are herbaceous perennial plants or annual plants growing 0.3–2 m (1 ft 0 in – 6 ft 7 in) tall. The leaves are simple, pinnate, or bipinnate, and arranged in opposite pairs. The flowers are produced in a capitulum with a ring of broad ray florets and a center of disc florets; flower color varies noticeably between the different species. The genus includes several ornamental plants popular in gardens. Numerous hybrids and cultivars have been selected and named.The generic name Cosmos derives either from the Greek ?????? (cosmos) ‘(ordered) world’ -in reference to the neat, orderly arrangement of the floral structures or the Greek ??????? (kósmima) ‘jewel’ - in reference to the jewel-like colours of the capitula (composite flowers).