Advanced Search Filters

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

ALLIUM nigrum

Image of Allium nigrum

Gerald L. Klingaman

Family

Liliaceae

Botanical Name

ALLIUM nigrum

Plant Common Name

Black Garlic

General Description

Black garlic, a bulbous perennial, is grown for its creamy white to pale lilac umbels, which bloom in the summer. Each umbel bears twenty to thirty large, open, cup-shaped flowers on deep purple stems. The flowers emerge from long strappy grayish green basal leaves. Alliums belong to the onion family and thus all have the familiar pungent fragrance when their leaves or stems are crushed. Black garlic is native to the Mediterranean where it grows in full sun and well-draining, often sandy soil.

In the fall, plant this bulb three inches deep (7 cm) in well-drained soil; rot can result if planted in wet soil. Once established, black garlic tolerates some drought. Reduce watering when the foliage starts to fade. Alliums have a tendency to self-sow; lift and divide the clumps only when they become crowded. Plant black garlic in groups in the mixed border, alpine bed, or rock garden.

Characteristics

  • USDA Hardiness Zone

    5 - 8

  • 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

    Bulb or Corm or Tuber

  • Sun Exposure

    Full Sun

  • Height

    16"-36" / 40.6cm - 91.4cm

  • Width

    16"-20" / 40.6cm - 50.8cm

  • Bloom Time

    Early Summer, Summer, Late Summer

  • Native To

    Eastern Europe, Southern Europe

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

    White, Purple, Light Pink, Violet

  • Foliage Color (Spring)

    Gray Green

  • Foliage Color (Summer)

    Gray 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

    Coarse

  • Foliage Sheen

    Matte

  • Evergreen

    No

  • Showy Bark

    No

Special Characteristics

  • Usage

    Alpine, Cutflower, Edging, Mixed Border, Rock Garden / Wall

  • Sharp or Has Thorns

    No

  • Invasive

    No

  • Attracts

    Hummingbirds, Butterflies

  • Self-Sowing

    Yes