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How to Grow Allium giganteum Plants in your Garden

Gardener's HQ Guide to Growing Giant Onion

Giant onion

allium giganteum photograph by Manuel.


Allium giganteum Growing and Care Guide

  • Scientific Name: Allium giganteum
  • Common Name: Giant onion
  • Growing Zone: USA: 6 to 10
  • Life Cycle / Plant Type: Herbaceous, Perennial

Plant Details

  • Plant Height (Inches): 60 to 72
  • Plant Spread (Inches): 6 to 9
  • Time of Bloom: Summer
  • Flower Details: Pink, Purple
  • Leaf Foliage: Green
  • Fruit:
  • Growth Form: Upright / erect

Ideal Growing Conditions

  • Best Light Conditions: Full sunlight
  • Rate of Growth: Quick
  • Suitable Soil Types: Adaptable, Loamy, Sandy, Well drained
  • Soil Moisture: Moist

Caring Conditions

  • Care:
  • Level of Maintenance: Medium
  • Propagation: Seed, 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
  • Diseases: Mainly trouble free, Onion white rot and downy mildew

Further Information

  • Can Attract:
  • Tolerant of: Rabbit, Deer, Black Walnut
  • Best Garden Use: Container, Foundation, En masse , Rock garden, Specimen
  • Family:
  • Closely Related Species:
  • Miscellaneous: Attractive foliage, Fragrant foliage, Non-native to North America, Attracts butterflies, Suitable for cut flowers, Suitable for dried flowers
  • Genus Detail: Allium
  • Further Reading and References: Here and Here



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