Cosmos are such wonderfully uncomplicated, beautiful flowers. When the garden is starting to look autumnal they come into their own. They love the heat and turn their simple pink flowers up to the sun in adoration. The bees love them and butterflies court them. The feathery green leaves look fresh when other plants are fading and by judicious dead heading of old blooms they can be encouraged to flower until the first frosts brings summer to a final close.