Blue Allium

Allium caeruleum

A mid-height ornamental onion with delicate blue flower spheres that bloom in early summer. Excellent for adding cool tones to borders.

Bloom time

Jun–Jul

Hardiness

Zones 3–9

Sun

Full sun

Water

Moderate water

Mature size

0.6 m × 0.2 m

Type

Bulb

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Bloom calendar

When Blue Allium is typically in flower across the year.

Growing Blue Allium

Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 0.6 m tall and 0.2 m wide at maturity, in roughly 2 years.

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Design a garden with this

Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.