Allium oreophilum (Ostrowskianum) Bulbs – Deep Magenta Globe, Fragrant, Deer Resistant, Fall Planting

Allium oreophilum — commonly known as Ostrowskianum Allium — is a brilliantly colored, compact ornamental onion producing quarter-sized deep magenta flower heads of unparalleled intensity among alliums. Its vivid, almost jewel-bright magenta is unlike any other allium in the palette, making it a standout front-of-border plant, rock garden specimen, and container bulb. Short in stature and charming in scale, it naturalizes happily among spring-blooming perennials, filling the gap between late spring bulbs and early summer bloomers with an eye-catching burst of color. Fragrant, a magnet for bees and butterflies, and an excellent cut and dried flower.

Why Gardeners Love It

• Deep, unrivaled magenta flower heads — the most intensely colored compact allium
• Fragrant blooms attract bees, butterflies, and beneficial pollinators
• Compact size ideal for borders, rock gardens, and container plantings
• Excellent fresh cut flower and dried flower
• Deer resistant — allium scent naturally deters browsers
• True perennial — returns reliably year after year in Zones 4–8

Growing Details

• Type: Ornamental Allium (compact)
• Bloom color: Deep magenta
• Bloom time: Late spring to early summer
• Bulb size: 5–7 cm
• Sunlight: Full sun to part shade
• Soil: Average, well-draining loamy soil
• USDA Hardiness Zones: 4–8
• Planting depth: 2–3× bulb diameter
• Spacing: Plant in generous groups for best effect
• When to plant: Fall

Planting & Care

Plant bulbs in full sun to part shade in well-drained soil in fall, at a depth of 2–3 times the bulb diameter. Fertilize in early spring with a well-balanced fertilizer. Allow foliage to die back naturally after blooming to build energy for next year. Plant among other perennials to mask withering foliage. Deadhead spent blooms to prevent self-seeding, or allow to naturalize freely.