Allium nigrum Bulbs – Snow White Ornamental Onion, Flat-Topped Globe, Deer Resistant, Fall Planting

Allium nigrum is one of the most refined and underappreciated ornamental onions available — a subtle, architectural beauty that brings elegant flat-topped, softball-sized silvery grayish-white flower heads with distinctive green midveins to early summer borders. Far from showy in the typical allium sense, Nigrum is a sophisticated pairing plant, complementing peonies, Siberian iris, ornamental grasses, and early summer perennials with a quiet, structural presence that elevates the whole planting. A reliable naturalizer and repeat bloomer that has graced gardens for decades, returning dependably year after year with virtually no maintenance.

Why Gardeners Love It

• Silvery grayish-white flat-topped umbels with distinctive green midveins — elegant and architectural
• Softball-sized flower heads on 24–30-inch stems — impactful yet refined
• Bridges the gap between spring tulips/daffodils and summer perennials
• Deer, rabbit, vole, and rodent resistant
• Naturalizes and returns reliably year after year
• Excellent fresh and dried cut flower

Growing Details

• Type: Ornamental Allium
• Bloom color: Silvery white with green midveins
• Flower form: Flat-topped softball-sized umbels
• Bloom time: Early summer (June)
• Height: 24–30 inches
• Sunlight: Full sun to part shade
• Soil: Average, well-draining
• USDA Hardiness Zones: 5–8
• Planting depth: 4–6 inches
• Spacing: 5–6 inches apart (4–5 bulbs per sq. ft.)
• When to plant: Fall

Planting & Care

Plant bulbs pointed tip up in well-drained soil in fall. Water well after planting. Water approximately 1 inch per week during active growth. Allow foliage to die back naturally after blooming to feed the bulb for next year. Deadhead to prevent self-seeding, or leave to naturalize. Divide congested clumps right after flowering if needed. Bulbs ship at the optimal time for fall planting in your region — plant promptly upon arrival for best results.