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The Plant Guide

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Ornamental onion

Allium giganteum

AL-ee-um jy-GAN-tee-um

In summer, this plant bears large rounded flower heads up to 4 inches across with a multitude of star-shaped lilac-pink flowers.

CareGrow in full sun and dry to average, well-drained soil.

PropagationSow seed in spring in containers or in situ. Divide clump-forming plants in spring.

ProblemsBulb rot in damp conditions. Onion fly and thrips.

  • Genus : Allium
  • Plant Width : 1 to 3 feet
  • Zones : 10, 6, 7, 8, 9
  • Plant Height : 3 to 6 feet
  • Plant Type : Bulbs
  • Moisture : Dry to Medium
  • Bloom Time : Early Summer, Late Spring, Spring, Summer
  • Growth Rate : Fast
  • Light : Full Sun
  • Maintenance : Low
  • Flower Color : Pink
  • Characteristics : Showy Seed Heads
  • Plant Seasonal Interest : Summer Interest
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