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Allium caeruleum (Azure-flowered garlic)
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2 hours care
per year
per year
1m
Max height
Max height
0.1m
Max spread
Max spread
2-5 years
To maturity
To maturity
Plant details
Botanical name
Allium caeruleum
Other names
Azure-flowered garlic, Blue-flowered garlic, Allium azureum , Allium 'Azureum', Allium caeruleum azureum, Allium coerulescens, Blue of the heavens, Blue globe onion
Genus
Allium Allium
Species
A. caeruleum - A. caeruleum is a clump-forming, bulbous perennial with linear, grey-green leaves and erect stems bearing compact, dense, rounded clusters of blue flowers in early summer.
Allium caeruleum is: Deciduous
Fragrance
Scented leaves
Habit
Clump-forming, Erect flower stem
Awards
RHS AGM (Award of Garden Merit)
Flower
Blue in Summer
Foliage
Grey-green in Spring; Grey-green in Summer
How to care
Watch out for
Specific pests
Slugs Slugs
Onion rot Onion rot
General care
Pruning
Cut back leaves only when they have completely died down.
Propagation methods
Seed, Offsets
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Where to grow
Allium caeruleum (Azure-flowered garlic) will reach a height of 1m and a spread of 0.1m after 2-5 years.
Suggested uses
Architectural, Cottage/Informal, Flower Arranging, Beds and borders, Underplanting
Cultivation
Grow best in fertile, well-drained soil in full sun. Add grit to clay soils prior to planting to improve drainage. Leaves may die back before or during flowering.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Moist but well-drained, Well-drained
Soil pH
Acid, Alkaline, Neutral
Light
Full Sun
Aspect
North, South, East, West
Exposure
Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
Companion plants
Botanical name
Allium caeruleum
Other names
Azure-flowered garlic, Blue-flowered garlic, Allium azureum , Allium 'Azureum', Allium caeruleum azureum, Allium coerulescens, Blue of the heavens, Blue globe onion
Genus
Allium Allium
Species
A. caeruleum - A. caeruleum is a clump-forming, bulbous perennial with linear, grey-green leaves and erect stems bearing compact, dense, rounded clusters of blue flowers in early summer.
Foliage
Deciduous
Fragrance
Scented leaves
Habit
Clump-forming, Erect flower stem
Awards
RHS AGM (Award of Garden Merit)
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Colour
Flower
Blue in Summer
Foliage
Grey-green in Spring; Grey-green in Summer
How to care
Watch out for
Specific pests
Specific diseases
General care
Pruning
Cut back leaves only when they have completely died down.
Propagation methods
Seed, Offsets
Monthly care advice
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Where to grow
Allium caeruleum (Azure-flowered garlic) will reach a height of 1m and a spread of 0.1m after 2-5 years.
Suggested uses
Architectural, Cottage/Informal, Flower Arranging, Beds and borders, Underplanting
Cultivation
Grow best in fertile, well-drained soil in full sun. Add grit to clay soils prior to planting to improve drainage. Leaves may die back before or during flowering.
Soil type
Chalky, Clay, Loamy, Sandy (will tolerate most soil types)
Soil drainage
Moist but well-drained, Well-drained
Soil pH
Acid, Alkaline, Neutral
Light
Full Sun
Aspect
North, South, East, West
Exposure
Sheltered
UK hardiness Note: We are working to update our ratings. Thanks for your patience.
Hardy (H4)
USDA zones
Zone 9, Zone 8, Zone 7, Zone 6, Zone 5, Zone 4, Zone 3
In order to add a note on this plant, please add this plant to your plant lists.
| This plant likes... | Garden match | |
| Soil types: | Chalky, Clay, Loamy, Sandy (will tolerate most soil types) | Tell us... |
| Soil drainage: | Moist but well-drained, Well-drained | Tell us... |
| Soil pH: | Acid, Alkaline, Neutral | Tell us... |
| Light: | Full Sun | Tell us... |
| Aspect: | North, South, East, West | Tell us... |
| Exposure: | Sheltered | Tell us... |
| Hardiness: | Hardy (H4) | Tell us... |
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