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AGERATUM 'Blue Horizon'

Image of Ageratum 'Blue Horizon'

James H. Schutte

Family

Asteraceae

Botanical Name

AGERATUM 'Blue Horizon'

Plant Common Name

Blue Horizon Flossflower, Flossflower

Special Notice

This entry has yet to be reviewed and approved by L2G editors.

General Description

Fluffy, pale violet-blue flowers bedeck the tall stems of the Blue Horizon flossflower when temperatures are warm and growing conditions favorable. Though technically a tender perennial, flossflower is widely grown as an annual bedding plant. It is a hybrid derived from plants native to Mexico and Central America where it grows as an evergreen subshrub with a dense, bushy habit; it can self-sow and is potentially weedy in frost-free regions.

The foliage of 'Blue Horizon' is an attractive jade green, heart-shaped and has scalloped edges. Throughout the season it produces numerous clusters of fluffy, light blue to pale blue-violet flowers. Bees and butterflies pollinate the lightly fragrant blooms. The spent flowers should be removed to encourage continuous bloom and to keep the plants looking clean.

Flossflower is easily grown from seed and needs sites with full sun and average, moist soil with good drainage. Where summers are hot, 'Blue Horizon' may flower best in locations with partial sun, or grown from fall to spring in tropical climates. This ornamental is rarely bothered by deer and has few pest and disease problems. Enjoyed as a colorful bedding plant since the Victorian times, this tall flossflower looks best in airy drifts or clumped accents in mixed borders with other brightly colored, sun-loving ornamentals. They make great cutflowers; they may also self-sow, causing a weedy nuisance in frost-free gardens especially.

Characteristics

  • AHS Heat Zone

    12 - 1

  • USDA Hardiness Zone

    10 - 13

  • Sunset Zone

    A1, A2, A3, H1, H2, 1a, 1b, 2a, 2b, 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

    Tender Perennial

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    25"-30" / 63.5cm - 76.2cm

  • Width

    12"-16" / 30.5cm - 40.6cm

  • Bloom Time

    Indeterminate

  • Native To

    Hybrid Origin

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Average

  • Soil type

    Loam, Sand

  • Growth Rate

    Fast

  • Habit

    Upright/Erect

  • Seasonal Interest

    Spring, Summer, Fall, Winter

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    Light Blue, Lavender, Blue Violet

  • Fruit Color

    Brown

  • Foliage Color (Spring)

    Green

  • Foliage Color (Summer)

    Green

  • Foliage Color (Fall)

    Green

  • Foliage Color (Winter)

    Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Single, Semi-Double

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    Yes

  • Showy Bark

    No

Special Characteristics

  • Usage

    Bedding Plant, Container, Cutflower, Mixed Border, Tropical

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Butterflies

  • Self-Sowing

    Yes