This daisy family (Asteraceae) genus, commonly known as Mexican aster, is found in the Americas from the tropics to the warm temperate zones. There are about 26 species, including annuals and perennials, of which 3 are commonly growth. The common annual Cosmos bipinnatus has fine feathery foliage and showy, large, open flowers with 8 ray florets. It is available in many colors and varieties from dwarf to 6 ft (1.8 m) tall. The common perennial species have broader leaves and smaller flowers but are valued for their colors and scent. Native Americans treated the young tops of C. sulphureus as a vegetable.
CULTIVATION
Annuals should be planted out only when all danger of frost ha passed. The perennials will tolerate occasional moderate frosts. Plant in a protected sunny spot with moist well-drained soil. Do not overfreed or the plants may become top-heavy-they may need staking anyway. Propagate the annuals from seed and the perennials from basal cuttings.
Top Tip
Cosmos species are great cut flowers. Cut them immediately after they open and place in warm water first, moving the flowers to a deep vase of cool water after a few minutes.
CULTIVATION
Annuals should be planted out only when all danger of frost ha passed. The perennials will tolerate occasional moderate frosts. Plant in a protected sunny spot with moist well-drained soil. Do not overfreed or the plants may become top-heavy-they may need staking anyway. Propagate the annuals from seed and the perennials from basal cuttings.
Top Tip
Cosmos species are great cut flowers. Cut them immediately after they open and place in warm water first, moving the flowers to a deep vase of cool water after a few minutes.
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