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Cosmos bipinnatus

Common Name(s):

Phonetic Spelling
KAHS-mos bye-pin-NAY-tus
Description

Tall Cosmos offers a variety of maroon, pink, lavender, and white flowers on stalks that will get up to 4 feet tall. Many cultivars and varieties are available.

Plant cosmos in a location that receives at least a half-day of direct sunlight. Sow the seeds outdoors after the danger of frost is past and when the soil has warmed to at least 65 degrees. Rake seeds into a loose soil; planting seeds too deeply will hinder germination. Keep the soil moist for 5 to 10 days after seeding. Seeds will germinate in 7 to 21 days. Cosmos needs only basic care to provide an abundance of colorful blooms all summer. Taller varieties may need staking if subjected to high winds and frequent storms.

When the spring-planted cosmos appears to have an abundance of dried seed, do not remove the plants. Encourage re-bloom by cutting the plants back to 12 to 18 inches high. They will be back in bloom in a month and the seed that is cut off will fall to the ground, germinate in the hot soil, and increase the density of your plant population and the eventual bloom display.

More information on Cosmos.

See this plant in the following landscape:
Cultivars / Varieties:
  • 'Candy Stripe'
  • 'Daydream'
  • 'Early Wonder'
  • 'Gazebo'
  • 'Psyche Mix'
'Candy Stripe', 'Daydream', 'Early Wonder', 'Gazebo', 'Psyche Mix'
Tags:
#showy flowers#full sun#annual#easy to grow#cut flowers#fall interest#summer flowers#long bloom time#naturalizes#spring interest#naturalized area#butterfly friendly
 
Cultivars / Varieties:
  • 'Candy Stripe'
  • 'Daydream'
  • 'Early Wonder'
  • 'Gazebo'
  • 'Psyche Mix'
'Candy Stripe', 'Daydream', 'Early Wonder', 'Gazebo', 'Psyche Mix'
Tags:
#showy flowers#full sun#annual#easy to grow#cut flowers#fall interest#summer flowers#long bloom time#naturalizes#spring interest#naturalized area#butterfly friendly
  • Attributes:
    Genus:
    Cosmos
    Species:
    bipinnatus
    Family:
    Asteraceae
    Life Cycle:
    Annual
    Recommended Propagation Strategy:
    Seed
    Country Or Region Of Origin:
    Mexico
    Wildlife Value:
    Attracts pollinators and butterflies
    Play Value:
    Attractive Flowers
    Attracts Pollinators
    Colorful
    Easy to Grow
    Dimensions:
    Height: 2 ft. 0 in. - 4 ft. 0 in.
    Width: 2 ft. 0 in. - 3 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Annual
    Habit/Form:
    Clumping
    Growth Rate:
    Rapid
    Maintenance:
    Low
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Soil Texture:
    Clay
    Loam (Silt)
    Sand
    Soil pH:
    Neutral (6.0-8.0)
    Soil Drainage:
    Good Drainage
    Available Space To Plant:
    12 inches-3 feet
    NC Region:
    Coastal
    Mountains
    Piedmont
  • Flowers:
    Flower Color:
    Gold/Yellow
    Pink
    Purple/Lavender
    White
    Flower Inflorescence:
    Head
    Flower Value To Gardener:
    Good Cut
    Long Bloom Season
    Long-lasting
    Showy
    Flower Bloom Time:
    Fall
    Spring
    Summer
    Flower Shape:
    Saucer
    Flower Petals:
    7 - 20 petals/rays
    Flower Size:
    3-6 inches
    Flower Description:
    2-4-inch saucer-shaped daisy-like blooms are available in a variety of colors and bloom all season.
  • Leaves:
    Leaf Color:
    Green
    Leaf Shape:
    Pinnatisect
    Hairs Present:
    No
    Leaf Description:
    Thread-like leaves are deeply cut.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Coastal
    Meadow
    Naturalized Area
    Landscape Theme:
    Butterfly Garden
    Children's Garden
    Cottage Garden
    Cutting Garden
    Pollinator Garden
    Design Feature:
    Border
    Foundation Planting
    Mass Planting
    Small groups
    Attracts:
    Bees
    Butterflies
    Pollinators