Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum
Allium giganteum

Allium giganteum

"Giant onion"

Allium giganteum

1 bulb — £2.48

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Delivery schedule

Orders placed before 1 September 2024
You can expect your order in August/September

Orders placed 1 September - 15 October 2024
You can expect your order in September/October

Orders placed 16 October - 15 December 2024
You can expect your order within 10 business days

Free delivery on UK orders over £50
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UK orders over £50
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UK orders under £50
£4.99

Northern Ireland orders under £50
£5.99

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— Ship carbon neutral;
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Description

Bring a sense of grandeur to your garden with the stately Allium giganteum. Affectionately dubbed giant onion, this classic horticultural marvel towers majestically with stems reaching a lofty 1.2-1.5m. Topped by globular inflorescences up to 15cm across, each sphere is densely packed with vivid purple, star-like florets, creating a spectacular display from late spring well into early summer.

Ideal for adding height and drama to your borders or as an eye-catching centerpiece, Allium giganteum is celebrated for its ease of cultivation and compatibility with a quintessential UK garden setting. Not only do they command attention with their regal presence, but Allium giganteum also chimes beautifully with classic garden companions such as roses, delphiniums, and peonies.

To get the best out of your giant alliums, plant Allium giganteum in groups, either near the back of flowering borders, or on their own. Now, it’s just a matter of waiting till late-spring for flowering magic to happen. Once planted in the autumn, these hardy Allium giganteum bulbs promise to emerge triumphantly year after year, with minimal maintenance required.

The fact Allium giganteum won a prestigious RHS Award of Garden Merit means you can rely on it giving you a spectacular, colourful display without fuss.

Key features

  • Good for cutting

  • Comes back every year

  • Attractive to wildlife

  • Loved by pollinators

  • Thrives well in full sun

  • Packed in paper bags

  • Low maintenance

  • RHS Award (AGM)

  • Fully hardy

  • Rodent resistant

Specs & details

  • Botanical name

    Allium giganteum

  • Flower colour

    Purple

  • Bulb size

    28/+

  • Established height

    1.2-1.5m

  • Established spread

    30-50cm

  • Plant spacing

    25 bulbs per m2

  • Leaf colour

    Green

  • Habit

    Upright

  • Life cycle

    Perennial

  • Hardiness

    Fully hardy

  • Years to establish

    1st year

  • Sunlight

    Full sun

  • Position

    Sheltered

  • Suitable for

    Large containers
    Borders
    Gravel gardens
    Wildlife gardens
    Cottage gardens
    Low maintenance gardens
    Cut flower gardens

  • Soil acidity

    Any

  • Soil moisture

    Free draining

  • Soil type

    Loam
    Sandy
    Clay
    Stony
    Multipurpose compost

  • Growing skill

    Easy to grow

  • Scented

    No

  • Pollinator-friendly

    Yes

  • Mouse resistant

    Yes

  • Rabbit resistant

    Yes

  • Deer resistant

    Yes

  • Toxicity

    Skin/eyes irritant

Plant calendar

JanFebMarAprMayJuneJulyAugSepOctNovDec
  • Planting
  • Flowering

Useful information

    • Plant your Allium giganteum bulbs from mid to late autumn;

    • Plant in borders or containers in sun or partial shade;

    • Plant your "Giant onion" bulbs two to three times as deep as the bulb is high;

    • Space the bulbs about twice the bulb diameter apart;

    • Place the Allium giganteum bulbs with the pointed side facing upwards.

    Read all Allium planting & care instructions

  • Orders placed before 1 September 2024
    You can expect your order in September 2024

    Orders placed 1 September - 15 October 2024
    You can expect your order in October 2024

    Orders placed 16 October - 15 December 2024
    You can expect your order within 10 business days

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