Cosmic Yellow Cosmos brings buttercup-yellow sunshine to gardens with minimal fuss. These 1- to 2-foot tall plants are smothered in semi-double to double 2-inch wide blooms that reach maturity in just 50-60 days. Rugged and reliable, they thrive in full sun across hardiness zones 10-13 and attract pollinators to beds, borders, containers, and meadows alike. A true care-free annual that delivers maximum impact for minimal effort.
Full Sun
Moderate
10-13
?in H x ?in W
—
Moderate
Hover over chart points for details
Buttercup-yellow semi-double to double flowers bloom prolifically across compact 1- to 2-foot plants, creating an effortless burst of color in any sunny spot. Pollinators gravitate to these blooms, making them a living garden magnet. From seed to flower in just 50-60 days, they reward gardeners with quick, abundant blooms and require almost no coaxing to perform beautifully.
Cosmic Yellow Cosmos shines as a cut flower and as a pollinator magnet in garden beds and borders. Plant it in containers for vibrant seasonal color, or scatter it through meadows and naturalized plantings where its cheerful blooms and pollinator-attracting power can truly shine.
No timeline data available yet for this variety.
Start seeds indoors 4-6 weeks before your last frost date. Keep soil temperature between 60-75°F for germination, which typically occurs within 7-14 days. Sow seeds 1/8 to 1/4 inch deep. Transplant seedlings once they develop their first true leaves.
Harden off seedlings gradually over 7-10 days by exposing them to outdoor conditions in increasing increments. Transplant after your last frost date, spacing plants 10 inches apart. Soil temperature should be at least 65°F for best results.
Direct sow seeds after the last frost date once soil has warmed to 65°F or above. Plant seeds 1/8 to 1/4 inch deep and keep soil consistently moist until germination occurs in 7-14 days.
Harvest blooms in early morning after dew dries but before heat stresses the flowers. Cut stems just above a leaf node or branching point to encourage bushier growth and continuous blooming. Blooms typically reach full size at 2 inches wide and maintain color for several days in a vase.
Enter your ZIP code to see a personalized growing calendar for this plant.