Giant Ornamental Onion
Common Name: Giant Allium
Family: Amaryllidaceae
Plant Type: Bulbous Perennial
Hardiness Zones: 5–8
Height: 3.0 to 4.0 feet (flowering stalk)
Spread: 1.0 to 1.5 feet
Bloom Time: Late spring to early summer (May–June)
Bloom Description: Large, dense globes of violet-purple star-shaped flowers
Sun Exposure: Full sun
Water Needs: Medium
Soil Preference: Well-drained; prefers sandy or loamy soil
Management Level: Low
Suggested Use: Borders, ornamental beds, architectural focal points
Attracts: Pollinators, especially bees
Tolerates: Drought, deer, rabbits
Notable Features: Dramatic flower heads, upright habit, architectural form
Native Range:
Central and Southwestern Asia, including Iran, Afghanistan, and surrounding regions; not native to North America.
Nebraska Growing Notes:
Although not native, Allium giganteum performs well in Nebraska gardens when planted in full sun and well-drained soils. Its tall, striking flower stalks create a dramatic focal point in ornamental borders and pair well with early summer perennials and grasses. Bulbs are typically planted in fall for spring bloom and can naturalize in place if left undisturbed.
Landscape Use:
Excellent for formal beds, modern designs, or mixed borders where a bold vertical accent is needed. Combines well with peonies, catmint, salvia, and ornamental grasses. Adds strong structure and color during the transition from spring to summer.
Caution:
Foliage begins to yellow by bloom time; consider planting among low-growing perennials to mask declining leaves. Ensure good drainage to avoid bulb rot in winter.
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