Common Cosmos, Mexican Aster. Cosmos are annuals, grown for their showy flowers. The flowerheads may be bowl– or open cup–shaped and are atop of long stems. Cosmos are easy to grow and make good border or container plants. They make for good decorations in flower arrangements and also attract birds, bees, and butterflies to your garden.


Family: Asteraceae (ass-ter-AY-see-ee) (Info)

Genus: Cosmos (KOS-mus) (Info)

Species: bipinnatus (by-pin-NAY-tus) (Info)


Category: Annuals


Height: 24-36 in. (60-90 cm), 36-48 in. (90-120 cm)


Spacing: 18-24 in. (45-60 cm)


Hardiness: Not Applicable


Sun Exposure: Full Sun


Danger: Parts of plant are poisonous if ingested


Bloom Color: Pink, Red, White/Near White


Bloom Time: Late Spring/Early Summer, Mid Summer, Late Summer/Early Fall, Mid Fall


Foliage: Blue-Green, Shiny/Glossy-Textured


Other details:

This plant is attractive to bees, butterflies and/or birds

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Self-sows freely; deadhead if you do not want volunteer seedlings next season


Soil pH requirements: 6.6 to 7.5 (neutral), 7.6 to 7.8 (mildly alkaline), 7.9 to 8.5 (alkaline)


Patent Information: Non-patented


Propagation Methods: From seed; sow indoors before last frost, From seed; direct sow after last frost


Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds. Properly cleaned, seed can be successfully stored

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