Cosmos are sun-loving plants with a long flowering season. They fill borders with a profusion of flowers, ranging in colour from white through to pink, red and orange, and they have masses of feathery foliage.
Grow cosmos in moist but free-draining soil in full sun. Deadhead to prolong flowering and cut it back in early winter, after the first frosts. Save the seeds from spent blooms to sow the following season.