The Plant Guide

Browse the Full Plant Guide

Blue globe onion

Allium caeruleum

AL-ee-um sir-EW-lee-um

This plant produces dense clusters of bright blue flowerheads up to 1 inch wide. Its leaves clasp its stem and die back before flowering.

CareProvide full sun and well-drained, average to dry 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 Height : 1 to 3 feet
  • Zones : 10, 4, 5, 6, 7, 8, 9
  • Plant Width : 6 to 12 inches
  • Plant Type : Bulbs
  • Moisture : Dry to Medium
  • Bloom Time : Early Summer, Summer
  • Growth Rate : Fast
  • Light : Full Sun
  • Maintenance : Low
  • Characteristics : Showy Seed Heads
  • Plant Seasonal Interest : Summer Interest

Plant Characteristics are only available to Fine Gardening members

Sign up for a free trial and get instant access to our complete plant guide as well as our entire collection of articles and videos.

Start Free Trial

Related Plants

Related Articles

More From the Plant Guide

Winter Interest

Partial Shade

Browse the Full Plant Guide