Germination: 7-10 days at 75°F. When planted outside, soil temperature must be above 60°F. For best results and highest germination rates use a heating mat.
Direct sowing: After last frost, once soil temperature is above 60°F, sow seed thinly in rows, barely covering the seeds. Thin when the first true leaves appear. Tall varieties may benefit from some wind protection.
Transplanting: Sow seed thinly, barely covering, 5-7 weeks before setting out. Keep soil moist until emergence. When the first true leaves appear transplant into larger containers. Harden off and transplant outdoors after the last frost. Plant in a location that receives full sun. Cosmos grow well in just about any soil conditions.
Plant Spacing: 9-12″
Hardiness Zone: Cosmos are annuals and can be planted in most hardiness zones.
Cut Flowers: Harvest when petals on the first flower are just opening, but not yet flattened. Deadheading is required to have blooms all summer.