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Allium caeruleum (Blue globe onion)

Allium caeruleum Photo/Illustration: Steve Aitken


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Hardiness Zones: 1 2 3 4 5 6 7 8 9 10 11
Botanical Name: Allium caeruleum AL-ee-um sir-EW-lee-um Common Name: Blue globe onion Genus: Allium
This plant produces dense clusters of bright blue flowerheads up to 1 inch wide. Its leaves clasp its stem and die back before flowering.
Care: Provide full sun and well-drained, average to dry soil.
Propagation: Sow seed in spring in containers or in situ. Divide clump-forming plants in spring.
Problems: Bulb rot in damp conditions. Onion fly and thrips.
Height 1 ft. to 3 ft.
Spread 6 in. to 12 in.
Growth Habit Clumps
Growth Pace Fast Grower
Light Full Sun Only
Moisture Dry to Medium
Maintenance Low
Characteristics Showy Flowers; Showy Seed Heads
Bloom Time Early Summer; Summer
Flower Color Blue Flower
Uses Beds and Borders
Style Cottage Garden, Meadow Garden, Rock Garden
Seasonal Interest Summer Interest, Fall Interest
Type Bulbs

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