Advanced Search Filters

Plant Type
Hardiness Zone
Heat Zone
Sunset Zone
Function
Sun Exposure
Soil Moisture
Water Requirement

COSMOS atrosanguineus

Image of Cosmos atrosanguineus

James H. Schutte

Family

Asteraceae

Botanical Name

COSMOS atrosanguineus

Plant Common Name

Chocolate Cosmos

General Description

Native to sunny meadows and open areas of Mexico, this appealing perennial is valued for its long-lasting display of velvety, dark maroon flowers that indeed emit a delicate cocoa scent. Spreading slowly via tuberous roots, it possesses an upright, branching habit and is covered with fresh green, somewhat fern-like foliage. Wiry, burgundy stems support a profusion of lush, chocolate-red flowerheads with slightly darker centers which bloom generously from summer into fall.

Chocolate cosmos prefers full sun and well-drained, reasonably fertile soil. At the colder end of its hardiness range, it benefits from the extra protection of winter mulch. Where not hardy, its roots may be lifted before the first frost and stored in lightly moist peat in a cool but frost-free place, much like dahlia tubers. The flowers are attractive to butterflies, and bloom more freely if plants are deadheaded regularly. Use this unique perennial in mixed beds and borders, or in containers where its deliciously-scented blossoms can be enjoyed up close.

Characteristics

  • AHS Heat Zone

    12 - 1

  • USDA Hardiness Zone

    7 - 9

  • Sunset Zone

    4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

  • Plant Type

    Perennial

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    24"-30" / 61.0cm - 76.2cm

  • Width

    12"-18" / 30.5cm - 45.7cm

  • Native To

    Mexico

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Loam

  • Growth Rate

    Medium

  • Water Requirements

    Average Water

  • Habit

    Upright/Erect

  • Seasonal Interest

    Summer, Fall

Ornamental Features

  • Flower Interest

    Showy

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Bedding Plant, Container, Mixed Border, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    No