Plant encyclopedia›three-cornered garlic

three-cornered garlic

Also known as: three-cornered leek; triquetrous leek

A bulbous plant with a triangular stalk up to 40cm tall and star-shaped flowers, petals each with a single green vein, produced from April to June. This attractive but rather weedy onion, native to southern Europe is occasionally cultivated intentionally but invariably becomes a nuisance, as it spreads freely by both bulbils and seeds

Scientific classification

Species: three-cornered garlic (Allium triquetrum)
Genus: Allium
Family: Amaryllidaceae

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Toxicity: Bulbs
Plant type: 0.1-0.5 metres
Height: 0.1-0.5 metres
Spread: Deciduous
Foliage: Clump forming
Habit: Spring · Summer · Autumn
Season of interest: Full sun · Partial shade
Sunlight: Information to be completed
Ideal temperature

three-cornered garlic pictures

Distribution of three-cornered garlic

Distribution map

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Culture

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Toxicity

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Quick identification of three-cornered garlic

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three-cornered garlic care guide

Moist soil during active growth, then reduce watering after foliage yellows
Watering: Full sun · Partial shade
Sunlight: Information to be completed
Ideal temperature

Watering

Moist soil during active growth, then reduce watering after foliage yellows

Fertilizing

Light bulb fertilizer at emergence and again after flowering

Pruning

No pruning required

Propagation

Please see cultivation notes

Growing

This plant is listed on Schedule 9 of the UK Wildlife & Countryside Act as an invasive non-native species. Although not banned from sale, it is an offence to plant or cause these to grow in the wild IN ENGLAND WALES, NORTHERN IRELAND and the REPUBLIC OF IRELAND. Gardeners possessing them should undertake measures to control them. See RHS advice on invasive non-native species for further information

More growing and care information →