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Allium caeruleum

Allium caeruleum
Blue-flowered garlic, Azure-flowered garlic, Ornamental Onion

4,2/5
30 reviews
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1 reviews
4 reviews

Bulbs planted upon receipt. I can't wait for spring to see the show, I didn't know this plant.

Geralde , 08/11/2024

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This plant carries a 6 months recovery warranty

More information

Graden Merit
A perennial with small, bright blue-green star-shaped flowers gathered in umbels. Beautiful in a garden and lovely in bouquets.
Flower size
5 cm
Height at maturity
80 cm
Spread at maturity
5 cm
Exposure
Sun
Hardiness
Hardy down to -12°C
Soil moisture
Dry soil, Moist soil
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Best planting time September to November
Recommended planting time September to December
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Flowering time May to June
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Description

Allium caeruleum is a decorative perennial bulbous plant that can be used in flower beds or as a cut flower. It produces beautiful umbels in May and June, with a bright blue colour and green reflections. These umbels, which are 3 to 5cm (1 to 2in) in diameter, contain 30 to 50 small star-shaped flowers. They are carried by sturdy stems.

This decorative garlic is native to temperate regions of Europe and Asia, as well as the Pamir mountain range. It stands at around 80cm (32in) tall. Its foliage is deciduous and medium green in colour. The leaves are 7cm (3in) long, linear in shape, and wither before flowering.

Semi-hardy, it can be grown in flower beds and borders, or as a standalone plant in the ground. It also works well in pots for balconies and patios. Its flowers can be used in bouquets.

Allium caeruleum in pictures

Allium caeruleum (Flowering) Flowering
Allium caeruleum (Plant habit) Plant habit

Plant habit

Height at maturity 80 cm
Spread at maturity 5 cm
Growth rate normal

Flowering

Flower colour blue
Flowering time May to June
Inflorescence Umbel
Flower size 5 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Botanical data

Genus

Allium

Species

caeruleum

Family

Alliaceae - Liliaceae

Other common names

Blue-flowered garlic, Azure-flowered garlic, Ornamental Onion

Botanical synonyms

Allium azureum

Origin

Cultivar or hybrid

Product reference515261

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Planting and care

Allium caeruleum is easy to grow. It does not tolerate extreme cold but prefers warm conditions in the garden or partially shaded in a warm climate. Plant it preferably in late October at a depth of 10cm (4in) with a spacing of 15 to 20cm (6 to 8in) between bulbs. Place it in rich, light, moist but well-drained soil. Keep the soil dry throughout the summer resting period. It dislikes humidity. When the soil is not sandy, place it in a rockery or remove the bulbs in July to replant them in September. Cut off faded flowers at the base while leaving the stem and remove the foliage once it turns yellow. Beware of onion flies, powdery mildew, and white rot.

Planting period

Best planting time September to November
Recommended planting time September to December
Planting depth 10 cm

Intended location

Type of use Border, Free-standing, Container
Hardiness Hardy down to -12°C (USDA zone 8a) Show map
Ease of cultivation Amateur
Planting density 25 per m2
Exposure Sun
Soil pH Any
Soil moisture Dry soil, Moist soil, Well-drained soil

Care

Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground
4,2/5

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