Mexican aster (Cosmos bipinnatus) thrives in full sun and dry, porous soil. Annual, 48 inches tall, 24 inches wide. Pink, red, white blooms summer into fall.
Sow seeds after frost danger passes. Germination in 1 week at 68–86°F. Blooms in 2–3 months.
Pinch back early to encourage branching and density.
Stake or support—tall stems flop easily.
Avoid over-fertilizing; it produces foliage at the expense of flowers.
Susceptible to bacterial wilt, powdery mildew, leaf spots, aphids, Japanese beetles.
Popular cut flower. Dramatic landscape plant in masses.
A low-maintenance, high-impact annual for sunny, well-drained sites.
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