Allium 'Globemaster' Bulbs – Giant Ornamental Onion, Deer Resistant, Fall Planting

Allium 'Globemaster' is one of the most spectacular and stately bulbs in the garden — sending up towering 4-foot stems crowned with enormous globe-shaped flower heads in a rich violet-purple that stop visitors in their tracks. A true giant among ornamental alliums, Globemaster stays in bloom for weeks in early summer, bridging the gap between spring tulips and summer perennials with a commanding vertical presence. The foliage remains green longer than similar giant alliums, and even the dried seedheads are ornamentally valuable well into fall. Deer resistant, bee and butterfly magnet, and a standout in mixed borders, cut flower gardens, and naturalized plantings.

Why Gardeners Love It

• Enormous violet-purple globe flower heads on 4-foot stems — a true garden statement
• Blooms for weeks in early summer — bridges the late spring gap perfectly
• Foliage stays green longer than other giant alliums
• Dried seedheads remain ornamentally attractive into fall
• Deer resistant and a magnet for bees and butterflies
• Excellent cut flower — fresh or dried

Growing Details

• Type: Ornamental Allium (Giant)
• Bloom color: Violet-purple
• Bloom time: Early summer (June)
• Height: Up to 4 feet
• Bulb size: 12–14+ cm
• Sunlight: Full sun to part shade
• USDA Hardiness Zones: 4–8
• Planting depth: 2× bulb height
• Spacing: 5–6 inches apart
• When to plant: Fall

Planting & Care

Plant bulbs pointed tip up in well-drained soil in fall, at a depth of about twice the height of the bulb. Fertilize with bulb food at planting. Water well after planting. After blooming, allow foliage to die back naturally. Deadhead before seeds disperse to prevent self-seeding, or leave seedheads for fall ornamental interest. Divide congested clumps right after flowering if needed.