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Purple spherical flowers with green stems against a blurred green background

Allium giganteum Flower Bulbs

Botanical Name: Allium giganteum

Large lilac-purple flower globes rise above borders on tall stems
Architectural 120cm plants create dramatic early-summer height
Size 20/22 bulbs are excellent for cutting and pollinators

3 bulbsSKU: 46637

From: 21/09/2026

£4.65 each

£13.95

Buy with confidence - quality guarantee

High germination rates

Expert growing support available

DescriptionDetailsSow & GrowGrow InPlanting CalendarDelivery

Allium giganteum Flower Bulbs produce large spherical flower heads packed with lilac-purple florets, held high above surrounding planting on strong stems. Their scale and structure make them superb architectural plants for the back or middle of sunny borders.

Supplied as a pack of 3 bulbs, plants reach around 120cm (4ft) and flower from May to June. They are excellent for cutting and highly attractive to pollinators. Plant from September to November in free-draining soil in full sun.

Bulb size: 20/22
Bulb sizes are measured by circumference in centimetres. A 20/22 bulb measures approximately 20-22cm around. Larger bulbs generally contain more stored energy, helping to support strong growth and an impressive flowering display.

About our Bulbs
We work very closely with our growers to ensure we offer the very best, top sized bulbs which will provide you with a glorious autumn show. All of the bulbs we offer have been trialled and tested, either on our own trials ground, here in Suffolk, or on those of our growers, who we work with to ensure we offer the best range for British gardens.

Key information

Botanical Name: Allium giganteum

Genus: Allium

Plant Class: Hardy Perennial

Characteristics & growing conditions

Plant Height: 1.2m/4ft

Colour: Purple

Habitat: Upright

Position: Full Sun

Attractive to: Attractive To Bees

Plant from September to November around 15cm deep in free-draining soil in full sun. Position towards the middle or back of a border where the tall flower stems can rise above surrounding perennials.

Recommended growing locations.

Border

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Sow Indoors

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Sow Outside

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Flowers / Harvest

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Hassle-Free Delivery

Looking for a hassle-free way to get your gardening essentials? Look no further than DT Brown! We know how important your garden is to you, and want you to be able to stock up on everything you need. All our delivery charges will automatically appear in your shopping basket.

Seed Only Orders

£2.95 delivery charge

Non-Seed Items

£6.95 delivery charge

Combined Orders

£7.95 delivery charge (e.g. seeds and plants)