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TRACHELIUM caeruleum

Image of Trachelium caeruleum

James H. Schutte

Family

Campanulaceae

Botanical Name

TRACHELIUM caeruleum

Plant Common Name

Blue Throatwort

General Description

Offering a summer-long succession of frilly flower heads, this tender perennial from the Mediterranean region has long been grown in gardens. The flat clusters of small starry blue, pink, or white flowers appear in late spring and continue through summer. They are held on waist-high stalks over loose clumps of toothed oval leaves. Plants bloom the first summer from an early spring sowing, making them useful as seed-grown annuals. They also often self-sow.

Give this plant full to partial sun and well-drained soil. Where hardy, use it in perennial beds and cottage gardens. It makes an excellent annual for gardens in colder regions. Deadhead to encourage continued bloom and prevent self-sowing. Its flowers are good for cutting and for attracting bees and butterflies. Cultivars include the compact and early-flowering Devotion Series.

Characteristics

  • AHS Heat Zone

    12 - 1

  • USDA Hardiness Zone

    9 - 13

  • Sunset Zone

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

  • Plant Type

    Tender Perennial

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    30"-40" / 76.2cm - 101.6cm

  • Width

    12"-15" / 30.5cm - 38.1cm

  • Bloom Time

    Late Spring, Early Summer, Summer, Late Summer

  • Native To

    Mediterranean

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Loam

  • Growth Rate

    Fast

  • Water Requirements

    Average Water

  • Habit

    Upright/Erect

  • Seasonal Interest

    Spring, Summer

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    White, Blue, Pink

  • Foliage Color (Spring)

    Green

  • Foliage Color (Summer)

    Green

  • Foliage Color (Fall)

    Green

  • Fragrant Flowers

    No

  • 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

    Container, Cutflower, Mixed Border, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Butterflies

  • Self-Sowing

    Yes