Allium caeruleumAllium azureum, Ornamental Onion, Blue Drumstick Allium

Hardy Bulb

What is Hardy Bulb?
Plant that grows from an underground storage organ.
Generally supplied in a dormant condition with no top growth.
Capable of withstanding outdoor winter temperatures down to -15C.


92% (5 Reviews)
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Perfect for dotting among herbaceous perennials

Adds structure to cut flower displays

Bright blue globes of starry flowers

Please note: This product cannot be delivered outside the United Kingdom.

Height Up to 60cm (24in)
Spread Up to 10cm (4in)

Hardy Bulb

cottage gardenswildlife gardenslow maintenance gardencut flower garden

full sun

Flowering Months

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Bright blue globes of starry flowers are carried on stiff upright stems in early summer. The rounded flowerheads often appear after the foliage has died back so this hardy bulb is best mingled among other perennials which will hide the yellowing leaves. Punctuating sunny borders with architecture and a bright splash of colour, Allium caeruleum is easy to grow and makes a great cut flower too! Height: 60cm (24"). Spread: 8cm (3").

Useful links:

How to grow bulbs, corms and tubers

20 allium bulbs (KC1292)

How to Grow
Alliums thrive in light sandy, well drained soil in full sun. Avoid planting in cold wet soils as the bulbs are prone to rot in these conditions. Plant allium bulbs at a depth of 10cm (4") and a distance of 10cm (4") apart. A slow release fertilizer can be added to poor soils at the time of planting to improve fertility. When growing alliums, plant them where the leaves of other plants will cover the base of their stems. This will hide the old foliage which dies back before flowering begins.
More Info
Alliums require little maintenance. Leave stems of faded allium flowers intact to enjoy their spectacular seedheads in autumn. Divide overcrowded clumps of alliums after flowering. Caution: irritant to skin and eyes.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

Thompson & Morgan strives to ensure that all its plants are delivered to you in the perfect condition for planting. Sadly, the time it takes to deliver to certain locations in the UK means that we can't guarantee this, so regretfully we are unable to ship live plants to the following areas: HS, IV41-IV49, IV51, IV55-56, KW15-KW17, PA34, PA41-48, PA60-PA78, PA80, PH40-PH44, TR21-TR24, ZE1-ZE3


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Allium caeruleum

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