Cosmos Culture: Annual. Germination: 14 days, 70 degrees F. Prefers full sun. Tolerates partial shade, poor soils, and drought once established. For earlier blooms sow indoors 4-6 weeks before last frost. Or sow outdoors after all danger of frost. Plant 1/4" deep; thin to 12"-14" spacing. Deadhead to prolong blooming. Seed heads will attract birds.
See also Sunflowers and Drying Flowers. Key to Flower Cultural Notes.