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Allium Bulbs

Allium bulbs are easy to grow and add colour to borders. Alliums are a great pollinator plant in various purples, blues, whites and yellows. They are perfect for adding architectural structure from May to June, and their seedheads add interest well into autumn.

Our top alliums for 2025

Alliums are a staple of the summer border and create show-stopper displays that return year after year. This year, we expect our most popular bulbs to sell out quickly, so grab your favourites before they disappear.

The most popular allium is Purple Sensation, and for good reason. Their striking silhouettes make them well-suited to gravel and prairie-style gardens. They have vibrant, densely packed, deep violet star-shaped flowers. The classic drumstick Allium sphaerocephalon is a fantastic late-flowering variety, blooming in July and August. Almost one metre high, they look stunning, planted en-masse and wave gently in the wind.

If you love the classic gigantic blooms, some really beautiful varieties exist. Allium Ambassador can grow up to 18cm across with densely packed flowers. If you love white flowers, Allium Mount Everest is a gigantic bloom that is a true show-stopper. Another giant is Allium giganteum, which lives up to its name at nearly two meters tall. For a large allium that is slightly different, try Allium cristophii with its 20cm wide spheres. The flowers are large stars less densely packed, giving them a galaxy-like appearance. Finally, Allium schubertii with its starburst effect. The flowerheads grow up to 30cm across and make beautiful dried flowers.

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Used at Chelsea
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41 items
Allium Ambassador

40% off

Allium 'Ambassador'
£9.99 £5.99
1 × bulb In stock (shipped within 1-2 working days)
1 star 1 star 1 star 1 star 1 star 5.0 5 1
Allium Gladiator

50% off

Allium 'Gladiator'
£9.00 - £35.98
5 × bulbs In stock (shipped within 1-2 working days)
2 litre pot | 1 per pot available to order from spring
2 + 1 FREE 2 litre pots available to order from spring
1 star 1 star 1 star 1 star 1 star 5.0 5 1
Allium Mercurius (PBR)

50% off

Allium 'Mercurius' (PBR)
£6.99 £3.50
1 × bulb In stock (shipped within 1-2 working days)
Allium Purple Rain

60% off

Allium 'Purple Rain'
£5.99 £2.40
5 × bulbs In stock (shipped within 1-2 working days)
0.75 star 1 star 1 star 1 star 1 star 4.7 5 53
Allium Silver Spring

60% off

Allium 'Silver Spring'
£9.99 £4.00
1 × bulb In stock (shipped within 1-2 working days)
Allium convallarioides yellow-flowered
Allium convallarioides 'yellow-flowered'
£9.99
10 × bulbs In stock (shipped within 1-2 working days)
Allium hollandicum Purple Sensation

Up to 50%

Allium hollandicum 'Purple Sensation'
£3.40 - £44.99
10 × bulbs In stock (shipped within 1-2 working days)
2 litre pot | 3 per pot available to order from spring
150 × bulbs available to order from summer
0.75 star 1 star 1 star 1 star 1 star 4.7 5 53
Allium hollandicum (aflatunense)

60% off

Allium hollandicum (aflatunense)
£2.40 - £4.79
5 × bulbs In stock (shipped within 1-2 working days)
10 + 5 FREE bulbs available to order from summer
0.75 star 1 star 1 star 1 star 1 star 4.7 5 7
Allium nigrum

Up to 50%

Allium nigrum
£3.50 - £8.39
10 × bulbs In stock (shipped within 1-2 working days)
20 + 10 FREE bulbs In stock (shipped within 1-2 working days)
0.25 star 1 star 1 star 1 star 1 star 4.3 5 4
Allium Round n Purple

50% off

Allium Round 'n' Purple
£9.99 £5.00
1 × bulb In stock (shipped within 1-2 working days)
Allium neapolitanum Cowanii Group

Up to 50%

Allium neapolitanum Cowanii Group
£2.74 - £6.59
25 × bulbs shipped within 2 weeks
50 + 25 FREE bulbs In stock (shipped within 1-2 working days)
0 star 0.25 star 1 star 1 star 1 star 3.3 5 6
200 alliums
200 alliums - Save £5.99
£34.95 £17.30
1 × collection available to order from summer
Amethyst allium collection
Amethyst allium collection
£55.50 £45.69
2 + 1 FREE collections | 150 bulbs available to order from summer
Award-winning allium collection
Award-winning allium collection
£13.18 - £46.73
1 × collection | 50 bulbs available to order from summer
2 + 1 FREE collections | 150 bulbs available to order from summer
Best white allium collection
Best white allium collection
£10.92 - £24.93
1 × collection | 40 bulbs available to order from summer
2 + 1 FREE collections | 120 bulbs available to order from summer
Big bold allium collection
Big bold allium collection
£13.18 - £46.92
1 × collection | 30 bulbs available to order from summer
2 + 1 FREE collections | 90 bulbs available to order from summer
Chelsea Jewelled Allium collection
Chelsea jewelled allium collection
£8.27 - £17.94
1 × collection | 20 bulbs available to order from summer
2 + 1 FREE collections | 60 bulbs available to order from summer
Favourite Alliums Collection
Favourite Alliums Collection
£19.04 - £52.96
1 × collection | 28 bulbs available to order from summer
2 + 1 FREE collections | 84 bulbs available to order from summer
Shades of purple - Allium collection
Shades of purple - allium collection
£13.18 - £39.95
1 × collection | 50 bulbs available to order from summer
2 + 1 FREE collections | 150 bulbs available to order from summer
Allium sphaerocephalon

40% off

Allium sphaerocephalon
£2.39 - £47.99
25 × bulbs In stock (shipped within 1-2 working days)
50 + 25 FREE bulbs In stock (shipped within 1-2 working days)
1000 × bulbs In stock (shipped within 1-2 working days)
2 litre pot | 7 per pot available to order from spring
2 + 1 FREE 2 litre pots available to order from spring
0.5 star 1 star 1 star 1 star 1 star 4.6 5 33
Allium Ambassador 'XXL bulb'
Allium 'Ambassador' (XXL bulb)
£12.99 £7.79
1 × bulb | extra large available to order from summer
Allium Caméléon
Allium 'Caméléon'
£6.99 £4.19
10 × bulbs available to order from summer
Allium Eros
Allium 'Eros'
£5.99 £2.40
5 × bulbs available to order from summer
0 star 0.5 star 1 star 1 star 1 star
Allium Globemaster
Allium 'Globemaster'
£4.00 - £35.98
1 × bulb available to order from summer
2 litre pot | 1 per pot available to order from spring
2 + 1 FREE 2 litre pots available to order from spring
0.75 star 1 star 1 star 1 star 1 star
Allium Miami
Allium 'Miami'
£5.99 £2.40
5 × bulbs available to order from summer
Allium Mont Blanc
Allium 'Mont Blanc'
£6.99 £3.50
1 × bulb available to order from summer
Allium Powder Puff
Allium 'Powder Puff'
£5.99 £3.59
5 × bulbs available to order from summer
Allium amplectens Graceful Beauty
Allium amplectens 'Graceful Beauty'
£5.49 £3.29
5 × bulbs available to order from summer
0 star 0 star 0.5 star 1 star 1 star
Allium atropurpureum
Allium atropurpureum
£4.79 - £9.59
10 × bulbs available to order from summer
20 + 10 FREE bulbs available to order from summer
0.75 star 1 star 1 star 1 star 1 star
Allium caeruleum
Allium caeruleum
£8.49 £4.24
20 × bulbs available to order from summer
0 star 1 star 1 star 1 star 1 star
Allium cristophii
Allium cristophii
£2.50 - £35.98
5 × bulbs available to order from summer
10 + 5 FREE bulbs available to order from summer
2 litre pot | 3 per pot available to order from spring
2 + 1 FREE 2 litre pots available to order from spring
0.75 star 1 star 1 star 1 star 1 star
Allium giganteum
Allium giganteum
£4.79 - £17.99
1 × bulb available to order from summer
2 litre pot | 1 per pot sold out
1 star 1 star 1 star 1 star 1 star
Allium karataviense
Allium karataviense
£6.99 £4.89
5 × bulbs available to order from summer
1 star 1 star 1 star 1 star 1 star
Allium moly
Allium moly
£6.99 £3.50
50 × bulbs available to order from summer
0.25 star 1 star 1 star 1 star 1 star
Allium roseum
Allium roseum
£3.20 - £9.59
25 × bulbs available to order from summer
50 + 25 FREE bulbs available to order from summer
1 star 1 star 1 star 1 star 1 star
Allium schubertii
Allium schubertii
£11.99 £6.00
5 × bulbs available to order from summer
1 star 1 star 1 star 1 star 1 star
Allium schubertii Arctic Snow
Allium schubertii 'Arctic Snow'
£10.90 £5.45
3 × bulbs available to order from summer
Allium siculum
Allium siculum
£12.99 £6.50
25 × bulbs available to order from summer
1 star 1 star 1 star 1 star 1 star
Allium stipitatum Mount Everest
Allium stipitatum 'Mount Everest'
£3.29 - £35.98
1 × bulb available to order from summer
2 litre pot | 1 per pot available to order from spring
2 + 1 FREE 2 litre pots available to order from spring
0.75 star 1 star 1 star 1 star 1 star
Allium stipitatum Violet Beauty
Allium stipitatum 'Violet Beauty'
£4.99 £2.50
5 × bulbs available to order from summer
1 star 1 star 1 star 1 star 1 star
Allium unifolium

60% off

Allium unifolium
£4.00 - £10.80
75 × bulbs In stock (shipped within 1-2 working days)
25 × bulbs available to order from summer

Top allium advice

When to plant allium bulbs

  • The best time to plant allium bulbs is between early and mid-autumn. Make sure you get them in time by buying your allium bulbs online and getting them delivered before planting season begins.

    Plant bulbs between September and November so they have time to establish strong root systems before the cold sets in. When spring arrives, your alliums can direct their energy into growing flowers instead of their root systems.

    Read more about how to plant allium bulbs in our comprehensive guide.

Alliums for drought-tolerant gardens

  • Alliums are a fabulous plant for drought-tolerant planting schemes. People often use them in Mediterranean or gravel garden schemes as they don't need much water and thrive in full sun.

    Sarah Price used them in our Nurture Landscapes Garden at the RHS Chelsea Flower Show this year. Sarah drew on inspiration from Cedric Morris's Benton End garden. She planted perennials and bulbs in naturalistic drifts for a drought-tolerant show-stopper. One of the main bulbs featured was allium siculum. Allium siculum, known as Sicilian honey garlic, is an exquisite form that creates an umbrella of apricot bell-shaped flowers. It flowers from May into June and looks wonderful in a natural planting scheme.

    Other popular Chelsea varieties are Allium atropurpureum with deep purple flowers and blueberry purple centres. You can pair it with Allium nigrum, with its perfect white star flower and green centre.

Our top allium collections

  • Take the guesswork out of which alliums to plant together with our curated allium bulb collections. They make buying allium bulbs online effortless by combining different flowering periods, heights and types for show-stopping summer displays.

    Try all the classics with our award-winning allium collection. The RHS trialled alliums in 2015, and these were some of the best, each winning an Award of Garden Merit. It combines Allium sphaerocephalon, Purple Sensation, Purple Rain, Violet Beauty and Cristophii. This beautiful collection will flower from May to August and is beneficial to pollinators.

    We picked three alliums that attract butterflies and made a butterfly collection for people who want a butterfly-filled garden. Allium Purple Sensation, nigrum and sphaerocephalon will create a beautiful display that will draw butterflies throughout the summer.

    If you prefer smaller, daintier alliums, we have our 200 allium bulb collection. It contains 200 dainty bulbs that will fill your borders for months of colours. Combining Allium moly, Cowanii Group, roseum, sphaerocephalon and unifolium, plant them at the front of borders for the biggest impact.

Giant allium bulbs

  • Add architectural structure to your borders with giant alliums, growing up to nearly two meters tall and with 30cm flowerheads. The biggest of the giant alliums must be gigantium. With deep lilac-pink flowers that form densely packed spheres, it stands at 1.8m tall.

    Gladiator is a great light lavender with large flowerheads that stand on upright stems above most herbaceous perennials. Round 'n' Purple has impressively large flower heads, one of the largest in the allium family. Plant in borders for maximum impact.

    See all giant allium bulbs

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