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RUDBECKIA hirta 'Radiance'

Image of Rudbeckia hirta 'Radiance'

James H. Schutte

Family

Asteraceae

Botanical Name

RUDBECKIA hirta 'Radiance'

Plant Common Name

Common Black-eyed Susan, Radiance Black-eyed Susan

General Description

The distinctive 'Radiance' has semi-double flowers with narrow petals that are cupped or fluted. The yellow outer petals form a thick ruff around the brown central cone. On occasion, flowers appear almost fully double and the center almost disappears in a bulging tuft of rounded petals.

Common black-eyed Susan, also called gloriosa daisy, is a short-lived perennial that originates from North America. It is wonderfully easy to grow and blooms for an extended period of time. Throughout the summer, this clump-forming, short-lived perennial puts forth, thick, leafy stems topped with large flowers that attract pollinators such as bees and butterflies. The pretty semi-double daisies make great cut flowers. Deadhead regularly to encourage continued bloom.

Rudbeckia hirta grows best in full sun and well-drained, average soil. It is prone to root rot and powdery mildew, so space it well to encourage good air flow and allow its soil to dry between watering. This popular ornamental is at home in wildflower gardens, cutting gardens and mixed borders. ‘Radiance’ will self-sow but less than most.

Characteristics

  • AHS Heat Zone

    7 - 1

  • USDA Hardiness Zone

    3 - 7

  • Sunset Zone

    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

    Perennial

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    24"-36" / 61.0cm - 91.4cm

  • Width

    12"-18" / 30.5cm - 45.7cm

  • Bloom Time

    Early Summer, Summer, Late Summer, Early Fall

  • Native To

    North America

Growing Conditions

  • Soil pH

    Acidic, Neutral, Alkaline

  • Soil Drainage

    Well Drained

  • Soil type

    Clay, Loam, Sand

  • Growth Rate

    Fast

  • Water Requirements

    Drought Tolerant, Average Water

  • Habit

    Clump-Forming

  • Seasonal Interest

    Summer, Fall

Ornamental Features

  • Flower Interest

    Showy

  • Flower Color

    Yellow, Gold

  • Flower Color Modifier

    Bicolor

  • Fruit Color

    Brown

  • Foliage Color (Spring)

    Dark Green

  • Foliage Color (Summer)

    Dark Green

  • Foliage Color (Fall)

    Dark Green

  • Fragrant Flowers

    Yes

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    No

  • Flower Petal Number

    Double, Semi-Double

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Coarse

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Bedding Plant, Cutflower, Mixed Border, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Butterflies

  • Self-Sowing

    Yes