Giant onion (Allium giganteum) is a bulbous (or similar) plant that can grow 50cm – 1.5m tall and 10cm – 50cm wide.
This plant has several common names including: giant onion or giant allium.
This is a deciduous plant that takes 2-5 years to reach full maturity.
Plant profile
Common name: giant onion, giant allium
Scientific name: Allium giganteum
Plant type: Bulbs
Habit: Columnar / Upright
Height: 50cm – 1.5m
Spread: 10cm – 50cm
Foliage: Deciduous
Sunlight: Full Sun
Soil: Chalk, Clay, Loam, Sand
Moisture: Moist but well drained, Well drained
Garden type: Informal Garden
Planting type: Cut Flowers, Flower borders and bedding
Other characteristics: Plants for pollinators
Seasonal colors
| Season | Stem | Foliage | Flower | Fruit |
|---|---|---|---|---|
| Spring | ||||
| Summer | ||||
| Autumn | ||||
| Winter |
How to plant Giant onion (Allium giganteum) – H. Zell, CC BY-SA 3.0, via Wikimedia Commons
Cultivation profiles – Growing Giant onion (Allium giganteum) – Chris Gladis from Kyoto, Japan, CC BY 2.0, via Wikimedia Commons
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