Sensation Radiance Cosmos is a tall, luminous cultivar of Cosmos bipinnatus that brings vibrant color and effortless grace to summer and fall gardens. Growing 48 to 60 inches tall, it reaches full bloom in 56 to 84 days from seed, making it fast enough for even short growing seasons across hardiness zones 2 through 11. This variety thrives on neglect, needing minimal water once established, yet rewards you with weeks of radiant flowers that attract pollinators and hold their beauty well into November.
Full Sun
Low
2-11
60in H x 24in W
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High
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Reaching nearly five feet tall, Sensation Radiance Cosmos delivers dramatic height and color without fussy care or frequent watering. The long bloom window from early summer through late fall means you'll have flowers when many other plants are fading, and its drought tolerance makes it reliable even in dry spells. Starting from seed indoors takes just 4 to 5 weeks, or you can direct sow once frost danger passes and watch seedlings emerge in as little as three days.
Cosmos like Sensation Radiance are grown primarily as ornamental cut flowers and garden borders. Their tall, airy stems and long vase life make them excellent for cutting fresh arrangements, while their pollinator-friendly flowers support bees and butterflies throughout the growing season.
No timeline data available yet for this variety.
Start seeds indoors in pots 4 to 5 weeks before your last spring frost. Keep soil temperature around 60 to 75°F. Transplant outdoors after all frost danger has passed and soil has warmed.
Transplant seedlings outdoors after the last spring frost when soil temperature has warmed. Space plants 12 inches apart and harden off seedlings gradually to full sun exposure over several days before planting.
Direct sow seeds in spring after the last frost date. Scatter seeds or sow in rows, pressing them gently into soil. Seedlings emerge in 3 to 10 days.
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