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Allium Collection

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.


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An essential addition to borders and containers

Five unusual species in a range of colours and sizes

Bridges the seasons and creates valuable vertical acents


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

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Alliums are an essential addition to the late spring and early summer garden. They create a stunning contrast of shape and texture when planted amongst herbaceous perennials, create vertical accents in borders and containers, and make excellent cut flowers. Perfect for the low-maintenance garden, alliums are very easy to grow on well-drained soil and will virtually take care of themselves. This bumper pack contains five fantastic varieties in a range of colours and sizes to add unique interest to your borders, containers and rockeries for year after year!

Allium Collection contains:

Allium ampeloprasum (15 bulbs) – Globe-shaped heads of tightly packed, very pale mauve, almost white flowers on tall, strong stems that make a great vertical accent in cottage garden borders. Blooming in June and July, Allium ampeloprasum is also great for cut flower gardens and naturalising in meadows. The striking flowerheads are great for drying for an even longer-lasting arrangement! Height: 100cm (39"). Spread: 20cm (8").

Allium cowanii (15 bulbs) – Clusters of pure white, starry, long-lasting flowers that are perfect for cutting. Blooming in May and June, ornamental onion looks lovely planted in drifts at the front of a border or makes a great addition to mixed containers. Bees, butterflies and other pollinators are attracted to the nectar-rich, sweetly scented flowers. Height: 40cm (16"). Spread: 10cm (4").

Allium karataviense (5 bulbs) – A strikingly unusual allium from the mountains of Kazakhstan. Globe-shaped heads of starry, pinkish white flowers emerge in May and June on short stalks from between a pair of remarkable broad, glaucous leaves; themselves a spectacular feature. Ideal for rock gardens and makes a great dried flower. RHS AGM. Height and spread: 25cm (10").

Allium moly (40 bulbs) – A ray of sunshine! This vigorous and cheerful little allium produces dense clusters of bright yellow, star-shaped flowers from late spring onwards – sure to brighten up any corner of the garden. Loved by butterflies, Allium moly is ideal for the front of borders, rockeries and containers. Height: 15cm (6"). Spread: 5cm (2").

Allium sphaerocephalon (30 bulbs) – An understated allium with unusual oval-shaped, purple-green flower heads perched atop tall, slender stems that are great for cutting. Best grown in dense clumps amongst other perennials, Allium sphaerocephalon associates particularly well with swaying grasses. Flowering in May and June, it’s great choice for sunny borders and gravel gardens. Height: 90cm (36"). Spread: 8cm (3").

Show Codes

105 Bulbs (KF0910)

How to Grow
Alliums thrive in free-draining soils in full sun. If growing in clay soils, add grit when planting to improve drainage. 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 seed heads in autumn. Divide overcrowded clumps of alliums after flowering. Caution: irritant to skin and eyes.

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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