Growing Guide
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Allium, Giant

Spring-Flowering Bulb, Summer and Fall-Flowering Bulb

Allium giganteum
Alliaceae Family

The Giant Allium bears tight, 4-inch-wide spherical heads of tiny lilac blooms on 5- to 6-foot tall stems.

Site Characteristics
  • full sun

Soil conditions:

  • requires well-drained soil
Prefers fertile, very well-drained soil.

Hardiness zones:

  • 6 to 10
May be hardier in colder Zones with excellent drainage and protective mulch.
Plant Traits

Lifecycle: perennial

Ease-of-care: easy

Height: 5 to 6 feet

Spread: 1.5 to 2 feet

Bloom time:

  • late spring
  • early summer

Flower color: violet

Foliage color:

  • light green
  • medium green

Foliage dies back before the plant blooms.

Foliage texture: medium

Shape: upright

Shape in flower: flower stalks with flowers as globes

Special Considerations
Special characteristics:
  • deer resistant
  • non-aggressive
  • non-invasive
  • not native to North America - Native to Central Asia
Special uses:
  • cut flowers
Growing Information
How to plant:

Propagate by division or separation - Plant the bulbs 4" beneath the soil surface in fall.

Divide in fall every 2 or 3 years.

Maintenance and care:
Apply mulch in fall for winter protection.

More growing information: How to Grow Bulbs

Onion fly
White rot
Bulb rot
Purple blotch
Gray mold