Overview
Allium giganteum is a plant with a clump-forming habit in the genus Allium, part of the Amaryllidaceae family, with deciduous foliage. It typically grows around 1.5 metres tall. Allium giganteum grows best in full sun, and tolerates most soils and any pH. Its UK hardiness is rated H6. Suggested uses include borders, cut flowers, dried flowers and architectural planting.
About
Allium giganteum, common name giant onion or giant leek, is an Asian species of onion in the amaryllis family (Amaryllidaceae), subfamily Allioideae, native to central and southwestern Asia but cultivated in many countries as a flowering garden plant. It is the tallest species of Allium in common cultivation, growing to 1.5 metres (4.9 ft).
Wikipedia contributors, CC BY-SA 4.0 — Allium giganteum
About the genus
Allium is a large genus of monocotyledonous flowering plants with 1112 accepted species, making Allium the largest genus in the family Amaryllidaceae and among the largest plant genera in the world. Many of the species are edible, and some have a long history of cultivation and human consumption such as the onion, garlic, scallions, shallots, leeks, and chives.
Wikipedia contributors, "Allium", CC BY-SA 4.0 — Allium
Growing conditions
Best soil and position for Allium
- Sunlight
- Full sun
- Soil type
- Loam, Sand, Chalk
- Soil pH
- Acid, Alkaline, Neutral
- Soil moisture
- Well-drained
- Aspect
- South-facing, East-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H6
Plant details
Allium giganteum size, habit and characteristics
- Habit
- Clump-forming
- Foliage
- Deciduous
- Height
- 1.5 metres
- Suggested uses
- Borders, Cut flowers, Dried flowers, Architectural planting
Care notes
Pruning and caring for Allium giganteum
- Propagation
- Offsets, Seed
- Pest resistance
- Allium leaf miner, Onion fly
- Disease resistance
- Onion white rot, Onion downy mildew, Leek rust
Frequently asked questions
Where is the best place to plant Allium giganteum?
Allium giganteum prefers full sun. It suits sheltered positions.
What soil does Allium giganteum need?
Allium giganteum is adaptable and grows happily in most soil types, including loam, sand and chalk. It is happy in soil of any pH. Aim for soil that stays well-drained.
How big does Allium giganteum grow?
Allium giganteum reaches a height of 1.5 metres.
Is Allium giganteum hardy in the UK?
Allium giganteum has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.
How do I propagate Allium giganteum?
Offsets, Seed.
More in the Allium genus
- Allium 'Judith'

- Allium 'Summer Beauty'

- Allium cepa 'Goldito'
- Allium christophii (albopilosum)Star of Persia

- Allium hookeri 'Zorami'Hooker Chives

- Allium phanerantherumconspicuous-anthered garlic

- Allium 'Millenium'
- Allium schmitzii