Blue Globe Onion
Allium caeruleum
A mid-height ornamental onion with delicate blue flower spheres that bloom in early summer. Excellent for adding cool tones to borders.
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Growing Blue Globe Onion
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–9. Expect it to reach about 2 ft tall and 8 in wide at maturity, in roughly 2 years.
When to plant Blue Globe Onion
Blue Globe Onion is tender: plant it out after the last frost, once the soil has warmed. In the middle of its hardy zones 3 to 9 range that means April or May; where spring comes later, it goes out later. Expect flowers from June to July.
Month-by-month timing for your zone is on the planting calendar: for the middle of its range, start with zone 6 in April.
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