Giant Allium (Allium giganteum) is a dramatic ornamental bulb prized for its towering flower stalks and large, globe-shaped clusters of hundreds of star-shaped purple flowers. Blooming in late spring to early summer, the flower heads can reach 4 to 6 inches in diameter and rise 3 to 5 feet above the landscape, creating a bold architectural statement. Native to Central Asia, Giant Allium performs best in full sun and well-drained soils and becomes drought tolerant once established. The blooms are highly attractive to bees, butterflies, and other pollinators, while the onion-scented foliage helps deter deer and rabbits. The dried seed heads often persist after flowering, adding texture and interest to the garden. Giant Allium is particularly effective when planted in groups among perennial borders, cottage gardens, pollinator plantings, and formal landscape designs.
Plant Description
Common Name(s): Giant Allium, Ornamental Onion
Genus: Allium
Species: giganteum
Plant Requirements
Plant Type: Bulb
Zones (1-13): 4-8
Light Needs: Full Sun
Water Needs: Moist
Available Space To Plant: 12 in - 3 ft
Height: 4-6 ft
Spread: 1-2 ft
Maintenance: Low
Plant Characteristics
Flower Characteristics: Showy, Good cut, Good dried
Bloom Color: Purple
Bloom Time: Spring
Leaf Color: Green
Attracts Wildlife: Butterflies
Plants that Tolerate: Rabbit, Deer, Drought
Uses: Naturalize