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CENTAUREA cyanus

Image of Centaurea cyanus

James H. Schutte

Family

Asteraceae

Botanical Name

CENTAUREA cyanus

Plant Common Name

Batchelor's Buttons, Cornflower

General Description

Cornflower is a short-lived annual that can be found growing in northern temperate regions across the globe. Its rich blue blooms are thistle-like in appearance and appear atop tall stems. There are many cornflower cultivars with flowers in shades of blue, purple, pink or white. One notable selection is the dwarf 'Florence White' that becomes covered with bright white flowers. Plant these in sunny sites with well-drained soil and remove spent flowers to prolong bloom time. Cornflower is a useful cutflower and a cottage garden favorite, but it self sows and may naturalize.

Characteristics

  • AHS Heat Zone

    7 - 1

  • Plant Type

    Annual

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    1'-3' / 0.3m - 0.9m

  • Width

    1'-2' / 0.3m - 0.6m

  • Bloom Time

    Indeterminate

  • Native To

    World/Pandemic, North America, Europe, Russia/Siberia, China, Korea

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Loam, Sand

  • Tolerances

    Pollution, Drought

  • Growth Rate

    Very Fast

  • Habit

    Upright/Erect

  • Seasonal Interest

    Spring, Summer, Fall

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    Blue, Sky Blue, Indigo, Dark Blue

  • Fruit Color

    Brown, Sandy Brown

  • Foliage Color (Spring)

    Sea Green, Gray Green

  • Foliage Color (Summer)

    Sea Green, Gray Green

  • Foliage Color (Fall)

    Sea Green, Gray Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Cutflower, Mixed Border, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    Sometimes

  • Attracts

    Butterflies

  • Self-Sowing

    Yes