Thompson & Morgan

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Allium Bulbs

Allium bulbs are easy to grow and undemanding summer flowers, adding height and structure to your beds and borders. Read our guide for more information on how to grow bulbs.

Buy alliums online from our range below and you will achieve a striking display in the autumn, when the structural seed heads catch the eye.

We have found 2 products.

Allium 'Big Impact Mixed'

Ornamental Onion

  • Customer favourite
Add height and structure to your borders with these superb summer-flowering bulbs. Undemanding and easy to grow, Allium 'Big Impact Mixed' will give you a wonderful assortment of flower shapes, sizes and colours that are superb for cut flower displays. Don't forget that their attractive and architectural seed heads will also add autumnal interest later in the season. Height ranges from: 60 -90cm (24-36"). Spread: 15cm (6"). Bulb size: 14/16.

Useful links:

How to grow bulbs, corms and tubers


4 for 3 on autumn planting bulbs
More info
    • 8 allium bulbs

    • Despatch: Within 28 days
    • SAVE £3.00  
    • £9.99 £6.99
    • 16 allium bulbs

    • Despatch: Within 28 days
    • SAVE* £9.99  
    • £19.98 £9.99
    • 32 allium bulbs

    • Despatch: Within 28 days
    • SAVE* £22.97  
    • £39.96 £16.99

Allium 'Purple Sensation'

Ornamental Onion

One of the best and most majestic Alliums for your late-spring garden, 'Purple Sensation' is a sun-loving, drought-tolerant variety producing spectacular lilac-purple flowers up to 15cm (6in) in diameter. Be sure to plant among other perennials that also have good structure. Height: 90cm. Spread: 30cm. Bulb size: 10/12. More info
    • 24 allium bulbs

    • Despatch: Within 28 days
    • £11.99
    • 48 allium bulbs

    • Despatch: Within 28 days
    • £23.99