Giant Onion – Allium giganteum

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Giant Onion – Allium giganteum

Common Name: Giant Onion

Botanical Name: Allium giganteum, A-lee-um ji-GAN-tee-um

Decorative Life: 14 days.

Flower Color:

Availability: ,

Harvest Instructions:

Harvest when flowers are about 30% open.

Family Roots:
  • Member of the Liliaceae (lily family).
  • Native of Central Asia.
  • Related species include agapanthus, clivia, lycoris and daffodil.
  • Flower clusters are globe-shaped, 4-5 inches in diameter.
  • Stems leafless, 3-4 feet tall.
  • Plant is a bulbous perennial, classed as a monocotyledon, leaves mostly parallel veined.
  • Cut stems produce onion-like odor.
Storage Specifics:


  • Largest of the ornamental onions. Flower clusters are 4-5 inch diameter balls of densely packed flowers on top of 3-4 feet stout, leafless stems. The specific epithet name of giganteum means large, gigantic.
  • Common garden flower. There have been no developments of commercial cultivars.
  • Allium, Latin name for garlic.
  • Harvest when about 1/3 of the flowers have opened.