Grow white cosmos in full sun in a well-drained, dry….

Poor soil. They thrive on neglect. Rich wet soil will produce floppy plants with many leaves and little flowers. Start from seeds indoors 6-8 weeks before last frost date or sow directly outdoors after last expected frost. To start seeds indoors: sow seeds and cover lightly with soil. Germination should take 5-10 days at 70-85°.