Allium 'Caeruleum' (Blue-Flowered Garlic)

Dispatch begins week of 14 September
Autumn planting varieties are seasonal and become available at the start of September. We will then prepare your order and begin dispatch during the week beginning Monday 14 September.

Choose your pack size Planting impact; savings vs smallest pack
25 bulbs
Planting coverageCreates a generous border group
£7.09
£0.28 each
50 bulbs
Most popular Creates a broad border drift
£13.09
£0.26 each
Save 8% each
100 bulbs
Best value Plants a substantial border display
£21.69
£0.22 each
Save 24% each

Free delivery on £40+ orders

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Bloom or Bust Guarantee

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

Allium 'Azureum' Blue - Harding & Bloom

Allium 'Caeruleum' (Blue-Flowered Garlic)

£7.09

£7.09

The Finest Bulbs

We partner with elite growers to provide only top-size, professional-grade bulbs. Bigger bulbs mean stronger roots and more spectacular blooms.

A Greener Thumb

We are committed to a healthier planet, using sustainable growing practices and mindfully chosen, recyclable packaging.

An Unrivaled Selection

Discover an extensive collection of both timeless classics and rare, exclusive varieties to create a garden that is uniquely yours.

Our Bloom Guarantee

If a bulb or plant fails to perform in its first growing season after the care instructions have been followed, we will normally offer a replacement or store credit for the affected item. This does not affect your statutory rights.

Kind Words from Our Gardeners

Arrived quickly and well-packaged. Planted them in some pots on the patio and they all came up. Look beautiful. Thank you!

Careane Wallace

Oxfordshire, UK

The bulbs arrived beautifully packaged and you could just tell they were excellent quality. We had the most wonderful display of daffodils this spring on our patio. Simply stunning. Will definitely be ordering again

David P

Kent, UK

I ordered the mixed hyacinth collection and the scent in my garden this April was absolutely heavenly. Every single bulb produced a strong, beautiful flower and the colours were stunning together. A fantastic purchase, I'll be back for more next year!

Eleanor R

Somerset