White Cosmo Flower is a pure white cultivar of Cosmos bipinnatus that brings summery, daisy-like charm to gardens across zones 2-11. Growing to a neat 24 inches tall with satin-textured petals on light green, feathery stems, this annual produces an abundance of blooms from seed to flower in just 75-90 days. Cosmos are famously easy to grow, making this variety a natural choice for beginners who want reliable, pollinator-friendly color without fuss.
Full Sun
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2-11
24in H x ?in W
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Moderate
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The petals have a beautiful satin texture that catches light in ways solid-colored flowers often don't, creating a subtle shimmer in the garden. Each plant produces masses of flowers throughout the season, turning a single packet of seed into an overflowing display of white blooms. The feathery, light green foliage is almost as ornamental as the flowers themselves, giving the whole plant an airy, whimsical quality that blends seamlessly into cottage gardens, borders, and cutting beds.
White Cosmos are grown primarily as ornamental flowers for garden beds, borders, and containers where their prolific blooming habit and pollinator appeal shine. They're especially valued as cut flowers, with the sturdy stems and long vase life making them reliable for fresh arrangements throughout summer and into fall.
No timeline data available yet for this variety.
Start seeds indoors 4-6 weeks before your last frost date in trays or pots, pressing seeds onto moist soil at 65-80°F. Seeds germinate in 7-10 days. Keep seedlings in bright light and maintain consistent moisture until transplanting.
Harden off seedlings over 7-10 days by gradually exposing them to outdoor conditions. Transplant outdoors after the last frost date when soil has warmed. Space plants 12 inches apart with rows 18 inches apart. Plant at the same depth they were growing in containers.
Direct sow seeds outdoors after the last frost date, pressing them onto moist soil. Seeds prefer light for germination, so do not cover with soil. Keep soil moist until germination occurs in 7-10 days.
Pinch back growing tips when plants reach 6 inches tall to encourage bushier growth and more prolific flowering. Deadheading spent flowers throughout the season keeps blooms coming steadily. As an annual, cosmos require no structural pruning but respond well to cutting stems for arrangements.
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