The open plant encyclopedia
Snap a photo or search by any name to see how to care for it, where it comes from, whether it's safe, and a 3D model you can turn.
The plants people record most in your country, and ones that grow there wild.
Filter by what you want to do, shape, origin, country, care and safety.
Allium giganteum
Also called Giant Allium, Ornamental Onion
Allium giganteum is a tall, bulbous ornamental onion from central and southwest Asia, reaching up to 1.5 metres with large purple flower globes in early to midsummer. Plant the bulbs deep in autumn in well-drained soil in full sun.
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).
In early to midsummer, small globes of intense purple umbels appear, followed by attractive fruiting umbels. A popular cultivar, 'Globemaster', is shorter (80 centimetres (31 in)) but produces much larger, deep violet, umbels (15–20 centimetres (5.9–7.9 in)). These globular umbels can contain thousands of florets (i.e. tiny flowers). A bulb dealer in Arcadia, California, counted 5286 florets from a single umbel. Both varieties have been granted the Royal Horticultural Society's Award of Garden Merit.
South Idaho onion · Abrams' allium · Allium aciphyllum · Tapertip onion · Allium aeginiense · Allium aflatunense · Allium agrigentinum · Allium alabasicum · Allium albotunicatum · Allium alibile · Altai Onion · Allium altissimum
Text excerpted from the Wikipedia article Allium giganteum by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
