Allium 'Caeruleum' (blue-flowered garlic)

Delivery begins from 14 September 2026
Spring flowering bulbs and plants are scheduled to begin delivery from 14 September 2026.

25 bulbs
£7.09
£0.28 each
50 bulbs
£13.09
£0.26 each
Save 8%
100 bulbs
£21.69
£0.22 each
Save 24%

Delivery begins from 14 September 2026

Carbon-Neutral Delivery

Our "Bloom or Bust" Promise

Caeruleum, often admired for its blue colouring, is a bulb variety especially well suited to borders.

Allium caeruleum azureum is a most refined choice for late spring into early summer, sending up slim, upright stems topped with perfectly rounded, sapphire-blue flower heads. Each globe is composed of neat, starry florets—wonderfully crisp in modern gravel schemes, yet equally at home threaded through a softly planted border.

Particularly useful where winter soils can sit wet: plant in pots or raised pockets of free-draining compost and let the colour float above emerging perennials. A quietly architectural allium, and a fine companion for roses and shrubs where its cool blue reads as an elegant foil.

  • Colour with poise: vivid blue globes for a clean, contemporary lift
  • Border and container friendly: excellent in pots where heavy ground can be troublesome
  • Wildlife-wise planting: pollinator friendly, with deer resistance
Botanical name Allium caeruleum azureum
Flower colour Blue
Bulb size 5/6
Established height 80cm
Established spread 10cm
Plant spacing 10-15cm
Leaf colour Green
Habit Upright
Life cycle Perennial
Hardiness Fully Hardy
Years to establish 1 year
Sunlight Full-Sun
Position Sheltered
Suitable for Borders, Containers, Cottage & informal gardens, City & courtyard gardens, Underplanting roses & shrubs
Soil acidity Any
Soil moisture Well-drained
Soil type Fertile, well-drained (container-friendly for heavy clay soils)
RHS Award (AGM) No
Growing skill Easy
Pollinator-friendly Yes
Deer resistant Yes

Where to Plant:

Allium 'Caeruleum' (blue-flowered garlic) needs full-sun and a warm, sheltered position for the best flowering. Plant into fertile, humus-rich soil that drains well, and choose a spot protected from strong winds, especially for taller varieties.

How to Plant:

Plant bulb from September to December once conditions are suitable. Set them at the correct depth for the variety, spacing 10-15cm apart where relevant, then firm in gently and water well after planting.

Aftercare:

Water regularly in dry weather and feed every two to three weeks once buds appear. Stake taller stems early and deadhead to keep plants flowering. After flowering, allow foliage to die back naturally before lifting or protecting bulb according to local conditions.

Planting and Flowering Calendar

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Key Features

Packed in paper

Packed peat-free

Great for Shade

Attracts wildlife

Good for cutting

Naturalising

£7.09

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