How to Grow Allium caeruleum Plants in your Garden

Gardener's HQ Guide to Growing Azure-flowered Garlic / Blue Globe Onion

Azure-flowered garlic

Allium caeruleum photograph by Col Ford and Natasha de Vere.

Allium caeruleum Growing and Care Guide

  • Scientific Name: Allium caeruleum
  • Common Name: Azure-flowered garlic, Blue globe onion, Blue ornamental onion, Blue-of-the-heavens, Blue-flowered garlic
  • Growing Zone: USA: 2 to 7
  • Life Cycle / Plant Type: Herbaceous, Perennial

Plant Details

  • Plant Height (Inches): 12 to 24
  • Plant Spread (Inches): 12 to 18
  • Time of Bloom: Late spring to Early summer
  • Flower Details: Blue
  • Leaf Foliage: Green
  • Fruit:
  • Growth Form: Upright / erect

Ideal Growing Conditions

  • Best Light Conditions: Full sunlight
  • Rate of Growth: Average pace
  • Suitable Soil Types: Loamy, Neutral, Sandy, Well drained
  • Soil Moisture: Dry

Caring Conditions

  • Care:
  • Level of Maintenance: Low
  • Propagation: Seed or clumps, sowing in containers in a cold frame when just ripe or in the spring. Alternatively, remove offsets in autumn
  • How to Prune: Not usually required
  • Pests: Usually pest free, onion fly, thrips
  • Diseases: Mainly trouble free, Onion white rot and downy mildew

Further Information

  • Can Attract:
  • Tolerant of:
  • Best Garden Use: Container, Rock garden, Specimen
  • Family: Amaryllidaceae
  • Closely Related Species:
  • Miscellaneous: Non-native to North America, Suitable for cut flowers
  • Genus Detail: Allium
  • Further Reading and References: Here and Here

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