Advanced Search Filters

Plant Type
Hardiness Zone
Heat Zone
Sunset Zone
Function
Sun Exposure
Soil Moisture
Water Requirement

ALLIUM rosenbachianum 'Purple King'

Image of Allium rosenbachianum 'Purple King'

Gerald L. Klingaman

Family

Liliaceae

Botanical Name

ALLIUM rosenbachianum 'Purple King'

Plant Common Name

Showy Onion

General Description

This bulbous perennial is grown for its large round deep-purple umbels of star-shaped flower clusters with prominent, almost sparkly stamens. It blooms in mid to late spring atop tall leafless stems. The broad, strappy, shiny basal leaves wither as the flowers emerge. This ornamental onion is similar to and often confused with several other Central and West Asian alliums.

Plant the bulbs in fertile, well drained soil at a depth two to three times their diameter. This plant likes ample sun and dryish summer conditions. Lift and divide the bulbs only when they become crowded. Plant this stately beauty in groups in the mixed border, rock garden, or herb and vegetable garden. Plant extra to cut since this allium is long-lasting in a vase or even dried.

Characteristics

  • Sunset Zone

    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

    Bulb or Corm or Tuber

  • Sun Exposure

    Full Sun, Partial Sun

  • Height

    24"-30" / 61.0cm - 76.2cm

  • Width

    6"-12" / 15.2cm - 30.5cm

  • Native To

    World/Pandemic, North America, Europe, Russia/Siberia, Northern Africa, Asia, India

Growing Conditions

  • Soil pH

    Neutral

  • Soil Drainage

    Well Drained

  • Soil type

    Loam, Sand

  • Tolerances

    Drought

  • Growth Rate

    Medium

  • Water Requirements

    Drought Tolerant, Average Water

Ornamental Features

  • Flower Interest

    Showy

  • Fruit Color

    Yellow Green

  • Foliage Color (Spring)

    Light Green

  • Foliage Color (Summer)

    Chartreuse

  • Foliage Color (Fall)

    Yellow Green

  • Fragrant Flowers

    No

  • Fragrant Fruit

    No

  • Fragrant Foliage

    No

  • Bark or Stem Fragrant

    Yes

  • Flower Petal Number

    Single

  • Repeat Bloomer

    Yes

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    No

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    Semi-Evergreen

  • Showy Bark

    No

Special Characteristics

  • Usage

    Cutflower, Dried Flower/Everlasting, Mixed Border, Rock Garden / Wall, Wildflower

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Hummingbirds, Butterflies

  • Self-Sowing

    Yes