Cosmos bipinnatus 'Sea Shells Red'
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Cosmos bipinnatus 'Sea Shells Red'

Mexican Aster 'Sea Shells Red', Cosmea 'Sea Shells Red', Cosmos 'Sea Shells Red', Sea Shell Series


Noted for its unusual blooms, Cosmos bipinnatus 'Sea Shells Red' is a half-hardy annual boasting flowers, 3 in. across (7 cm), with fluted petals, carmine red inside and lavender-pink on the outside. Blooming for months from midsummer to fall, the ravishing blossoms are borne atop tall stems and float above the fine, feathery foliage. Fairly pest-free and low maintenance, add this charming plant to the landscape and you will be rewarded with abundant butterflies. Creating a graceful visual impact in the garden, this annual cosmos is perfect at the back of sunny borders.

  • Grows up to 48-60 in. tall (120-150 cm) and 24 in. wide (60 cm).
  • Performs best in full sun, in average, moist, well-drained soils.
  • Ideal addition to beds and borders, containers, cottage gardens, and cutting gardens.
  • Keep an eye out for aphids, slugs, gray moulds.
  • Deadhead to prolong the flowering season.
  • Propagate by seed sown at 61°F (16°C) in mid-spring under glass, or in situ in late spring.
  • Cosmos bipinnatus species is native to Mexico.
  • Find where this species is invasive in the United States.
  • Discover beautiful U.S. native plant alternatives.

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Requirements

Hardiness 2 – 11
Heat Zones 1 – 12
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Cosmos
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 4' – 5' (120cm – 150cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles Cutting Garden, Informal and Cottage, Traditional Garden

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J Need, Shutterstock

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 2 – 11
Heat Zones 1 – 12
Climate Zones 1, 1A, 1B, 2, 2A, 2B, 3, 3A, 3B, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Annuals
Plant Family Cosmos
Exposure Full Sun
Season of Interest Summer (Mid,Late)
Fall
Height 4' – 5' (120cm – 150cm)
Spread 1' – 2' (30cm – 60cm)
Spacing 18" (45cm)
Water Needs Average
Maintenance Low
Soil Type Chalk, Clay, Loam, Sand
Soil pH Acid, Alkaline, Neutral
Soil Drainage Moist but Well-Drained
Characteristics Cut Flowers, Showy
Attracts Butterflies, Hummingbirds
Garden Uses Beds and Borders, Patio and Containers
Garden Styles Cutting Garden, Informal and Cottage, Traditional Garden

Great Plant Combination Ideas with Cosmos

Guides with Cosmos

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