Sensation Blend Cosmos brings a riot of color to summer gardens with its mixed flowering forms and hues, thriving across hardiness zones 2-11. This cultivar of Cosmos bipinnatus reaches 18-36 inches wide, creating full, generous plants that bloom reliably from midsummer through frost. Sow seeds directly outdoors after your last frost date when soil hits 60°F, or start them indoors 4-6 weeks earlier for a head start. These frost-tender annuals love full sun and well-draining soil with a pH between 5.5 and 7.5, rewarding minimal fuss with abundant flowers.
Full Sun
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2-11
?in H x 36in W
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Moderate
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Sensation Blend cosmos delivers the carefree charm that makes this genus so beloved by gardeners. The mixed color palette creates dynamic visual interest without requiring separate plantings, while the plants themselves stay reasonably compact and naturally full. Direct sowing is simple and reliable, with seeds germinating readily at 60°F, making this an excellent choice for gardeners new to seed starting or those who prefer the ease of outdoor sowing.
Cosmos flowers are grown primarily for cutting and garden display. The mixed blooms of Sensation Blend work beautifully in bouquets, fresh arrangements, and as long-stemmed contributions to the vase. In the garden, they fill beds and borders with sustained color throughout the summer and into early autumn, creating an informal, meadow-like quality that pairs well with other warm-season bloomers.
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Start seeds indoors 4 to 6 weeks before your average last frost date. Sow at 60°F soil temperature in seed-starting mix barely covering the seeds. Keep soil consistently moist but not waterlogged until germination occurs. Harden off seedlings by gradually exposing them to outdoor conditions over 7-10 days before transplanting.
Transplant seedlings outdoors 4 to 6 weeks before your average last frost date, or wait until all danger of frost has passed for a simpler timeline. Space plants 12 inches apart after they reach 1-2 inches in height. Soil temperature should be at least 60°F at transplanting time.
Sow directly outdoors 1 to 2 weeks after your average last frost date, when soil temperature is at least 60°F. Barely cover seeds with soil. Keep the seedbed evenly moist until seedlings emerge. Thin seedlings to 1 plant every 12 inches once they reach 1-2 inches tall.
Cut cosmos flowers for arrangements once they're fully open and the petals have developed their full color. Harvest in early morning when stems are fully hydrated for the longest vase life. Remove spent flower heads regularly to encourage the plant to continue producing new blooms.
Pinch back young plants when 6-8 inches tall to encourage branching and fuller form. Deadhead spent flowers regularly throughout the growing season to extend bloom time and redirect energy into new flower production rather than seed development.
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