Advanced Search Filters

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

ALLIUM giganteum

Image of Allium giganteum

Gerald L. Klingaman

Family

Liliaceae

Botanical Name

ALLIUM giganteum

Plant Common Name

Giant Flowering Onion, Giant Ornamental Onion

General Description

During the summer, the giant flowering onion reaches the height of many adults. Atop this long stem sits a lavender-pink globe the size of an orange. Each globe contains fifty or more star-shaped flowers with prominent stamens. Long, strappy leaves whither before this giant emerges. The giant onion is native to central Asia, where it grows in well-drained, often sandy soil in full sun.

Plant this bulb in the autumn six inches deep (15 cm)in well-drained neutral soil. Onions are drought tolerant once they are established. Decrease the watering when the foliage starts to fade; lift and divide the clumps when they become crowded. Grow the giant onion wherever you want to attract attention. Try it in the vegetable garden, perhaps amid the foliage of squash or pumpkin, which will visually anchor the tall bare stem.

Characteristics

  • AHS Heat Zone

    9 - 5

  • USDA Hardiness Zone

    6 - 10

  • 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

  • Height

    5'-6' / 1.5m - 1.8m

  • Width

    4"-6" / 10.2cm - 15.2cm

  • Bloom Time

    Summer

  • Native To

    Central Asia

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

  • Flower Color

    Light Pink, Lavender

  • Foliage Color (Spring)

    Light Green

  • Fragrant Flowers

    No

  • Fragrant Fruit

    No

  • Fragrant Foliage

    Yes

  • Bark or Stem Fragrant

    Yes

  • Flower Petal Number

    Single

  • Repeat Bloomer

    No

  • Showy Fruit

    No

  • Edible Fruit

    No

  • Showy Foliage

    Yes

  • Foliage Texture

    Medium

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Cutflower, Dried Flower/Everlasting, Feature Plant, Mixed Border, Rock Garden / Wall

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Hummingbirds, Butterflies

  • Self-Sowing

    Yes