Allium caeruleum / Allium azureum

("Blue globe onion / Ornamental garlic")

Allium caeruleum / Allium azureum

Produces nice dense clusters of bright blue flowerheads that are approx. 1" (3 cm) in diameter. Its leaves clasp its stem and die back before flowering so do combine them with low-growing perennials.

What You Need To Know Before You Plant:

When Will This Flower Bloom?

Late Spring - Early Summer

When Should I Buy and Plant These Bulbs?


What Kind of Light Does This Bulb Prefer?

Full sun

What Color Will the Flower Be?

Bright blue

How Far Apart Should I Plant These Bulbs?

2 in / 5 cm

How Deep Should I Dig?

4 in / 10 cm

How Tall Will It Grow?

20-24 in / 50-60 cm

Recommended Number of Bulbs Per Square Foot?


Is It Deer/Critter Resistant?


How Can I Best Use It in My Landscaping?

In flower beds, perennial beds and as fresh cut- and dried flowers.

What Should I Do After Flowering?

After they have finished blooming let the foliage die back naturally (to build up energy reserves within the bulb) and only remove the dead foliage once it has completely separated from the bulbs. You can either deadhead the finished blooms or allow them to dry and let the seeds be blown to other parts of your garden. Eventually they too will produce new alliums. Leave the bulbs in the ground and fertilize them with bonemeal, bulb booster or 10-10-20 early every Spring when the foliage begins to emerge again. Divide and replant them early Fall after they become overcrowded (and flowering diminishes) after 8-10 years.

Other Popular Varieties

Species only.

About the Family

Allium Family

Many hundreds of Allium species exist, but only a modest few have made a name for themselves as garden plants. The genus, Allium also includes important plants used for human consumption such as onions, leeks, shallots and the familiar cooking herb, chives.

Read More About the Family