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garden
Ornamental allium
Overview
Giant spherical flower heads in purple, pink, and white that float above the garden on tall, straight stems like botanical fireworks. Ornamental alliums are dramatic, deer-proof, and incredibly easy to grow from bulbs planted in fall. Their architectural seed heads remain attractive long after flowering and are stunning in dried arrangements.
Companion Planting & Soil
Good Companions
Avoid Planting Near
Soil pH6 — 7.5
Soil TypeWell-drained, moderately fertile soil
Planting Calendar
When to sow, transplant, and harvest by growing zone.
| Zone | Action | Months | Notes |
|---|---|---|---|
| Cold (1-2) | Transplant | Sep — Oct | Plant bulbs in fall 4-6" deep; deer and rodent proof; globe-shaped blooms |
| Cold (1-2) | Bloom | May — Jun | Purple globes on tall stems; foliage dies back during bloom — interplant to hide |
| Cool (3-4) | Transplant | Sep — Oct | Plant in fall; Globemaster and Purple Sensation are reliable performers |
| Cool (3-4) | Bloom | May — Jun | Late spring bloom; dried seed heads provide long-lasting garden structure |
| Moderate (5-7) | Transplant | Oct — Nov | Plant in fall; excellent drainage essential — rots in wet soil |
| Moderate (5-7) | Bloom | Apr — Jun | Spring bloom; pollinator-friendly; leave seed heads standing |
| Warm (8-9) | Transplant | Nov — Dec | Plant in late fall; most species need some winter chill |
| Warm (8-9) | Bloom | Mar — May | Spring bloom; bulb onion relatives |
| Hot (10+) | Transplant | Nov — Dec | Plant smaller species; large Dutch hybrids may not get enough chill |
| Hot (10+) | Bloom | Feb — Apr | Late winter/spring bloom |
Uses
Other Uses
- Dramatic architectural garden focal point
- Deer-proof and rodent-proof bulb
- Dried seed heads for arrangements and wreaths
