University of Wisconsin-Madison | Botany Plant Growth Facilities

Botanical Garden

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Genus: Allium Species: giganteum Common Name: Giant Onion Family: Alliaceae Order: Asparagales Native: Central Asia Habit: Herbaceous Perennial-Bulbous Height: 3 to 6 feet Width: 1.5 to 2 feet Flowering Season: Spring Flower Color: Purple Propagation: Seed or bulb Zone: 5-8 Note: This bulbous perennial is suitable for border backgrounds. When flowering begins the leaves start to die back. Plant may need staking while in bloom. Prefers sunny, moderately dry, well-drained, ordinary garden soil.

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