Allium triquetrum (Three-Cornered Leek)

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Allium triquetrum, commonly known as Three-Cornered Leek, is a bulbous flowering plant in the genus Allium (onions and garlic) native to the Mediterranean basin, is a fascinating plant that combines culinary value with ecological impact. It is characterized by its triangular stem, white bell-shaped flowers with green stripes, and a distinct garlic-like scent. This perennial plant is often found in damp woodlands and grassy areas.

Botanical Name
Allium triquetrum
Plant Type
Bulbous perennial
Grows up to 12-18 inches tall (30-45 cm)
Sun Exposure
Full sun to partial shade
Soil Requirements
Well-drained, fertile soil
Strongly three-angled stems emit a robust garlic scent when bruised or crushed
Foliage Color
Green with a white stripe
White, bell-shaped flowers with green stripes
Hardiness Zones
Fresh consumption or cooking
Natural Habitat
Often found in damp woodlands and grassy areas.
Special Features
Edible leaves and flowers
  • In late spring or early summer, white bell-shaped flowers appear in drooping one-sided clusters atop the stems. Each flower features six petals adorned with a green stripe down the middle.
  • Native to North-western Africa, the Azores, the Madeira Islands, and southern Europe.
  • All parts of the plant, from the bulb to the flowers, are edible. They offer a subtle leek or spring onion flavor.
  • Propagate by seed and vegetatively through bulbs and bulblets.
  • The plant is valued for its ornamental appeal and as a wild food source.
  • Forms dense colonies that can crowd out native grasses and groundcovers in suitable conditions (moist and shaded).
  • Non-toxic to humans, but can be mistaken for other toxic plants.
  • Generally pest-resistant. However, it can be affected by onion fly and leek moth.


Can I consume Three-Cornered Leek?

Yes, it is edible with a mild garlic flavor. However, individuals with allergies or sensitivities should exercise caution.

How do I control its invasive tendencies?

Regular monitoring, manual removal, and avoiding its introduction to sensitive ecosystems can help manage its invasiveness.

What’s the ideal planting location?

Partial to full shade with well-drained soil is preferred, replicating its native Mediterranean woodland habitat.

How can I propagate Three-Cornered Leek?

Propagation is achieved through bulb division in late summer or early autumn, or by sowing seeds in the fall.

Is it suitable for all climates?

While adaptable, Three-Cornered Leek thrives in Mediterranean climates. It may struggle in extreme cold or hot conditions.

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