Cosmos are native to the hot, dry regions of Central and South America, and are able to withstand drought conditions and periods of prolonged heat. Gardeners love them because they are low maintenance and flower from spring until the first serious frost.
Other reasons why cosmos are widely planted as components of cottage-style flower beds and cutting gardens are that they don't require rich soils and that they easily self-seed from one year to the next. They attract birds, bees, and butterflies to the garden area with their showy blooms. Urban gardeners who may only have a small patio or balcony to work with find that they grow well in containers.
Cosmos flowers are magenta, pink, white, orange, red,and yellow. Some varieties have multicolored flowers. There is a perennial variety of cosmos that has reddish-brown flowers that deepen to near-black as the season progresses and smell like chocolate.