Rose Bonbon Cosmos is a delightful cultivar of Cosmos bipinnatus that produces abundant, rose-pink double flowers from summer through fall. This compact variety reaches 24 to 36 inches tall and blooms reliably in 56 to 84 days from seed, making it an excellent choice for gardeners seeking continuous color without fuss. Its low water needs and drought tolerance mean it thrives in hot, dry summers while still attracting pollinators throughout the season.
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36in H x 24in W
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The rose-pink double flowers of this cosmos are a step above the typical single-petaled varieties you might expect, creating a fuller, more romantic appearance in the garden or in a vase. It flowers abundantly from June through November in most climates, requiring minimal water once established and practically no fertilizer to perform well. Starting from seed indoors just four to five weeks before your last spring frost gets you blooming by midsummer, or you can direct sow after the frost passes for a slightly later show.
Rose Bonbon Cosmos shines as a cut flower, with its double blooms holding up beautifully in arrangements and lasting well in a vase. The plants are equally stunning in garden borders, cottage gardens, and mixed beds where their airy foliage and continuous flowering provide texture and color without demanding constant attention. Many gardeners use them to fill gaps in late-summer beds or to add height and movement to front-of-border plantings.
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Start seeds indoors in pots 4 to 5 weeks before your last spring frost, keeping the soil temperature between 60 and 75°F. Seeds sprout within 3 to 10 days and should be transplanted outdoors after hardening off.
Transplant seedlings outdoors after your last spring frost date, spacing them 1 inch apart in full sun. Harden off plants by gradually exposing them to outdoor conditions over several days before planting.
Direct sow seeds in spring after your last frost date. Sow at a depth of 1/8 to 1/4 inch and keep the soil moist until seedlings emerge.
Harvest cosmos flowers by cutting them in the morning when blooms are fully open, using clean sharp scissors or shears. Cut stems at a 45-degree angle just above a leaf node to encourage branching and more blooms. Cut frequently to extend the flowering season; removing spent flowers or buds prompts the plant to keep producing new blooms throughout summer and fall.
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