Some similarities to :

• Ransoms (Allium ursinum) for that too has triangularstems (but they are isosceles triangles, rather than the right-angled triangles of Three-cornered Garlic). Ransoms have broader leaves, and flowers that are no Daffodil-shaped.
• Few-flowered Garlic (Allium paradoxum) but that has square stems, fewer flowers and, lacking a longish conical section to the flowers, with the flowers more abruptly flared.

Slight resemblance to : many other Garlic species flowers.

No relation to : Three-cornered hat [a Ballet by Falla] nor to Three-nerved Sandwort nor Three-lobed Crowfoot [un-related plants].

Inhabits dampish places where it is warmer. Considered a problem plant in some areas where it spreads un-controllably. Occupies mainly southern parts of the UK, mainly within 50 miles of the sea, with far fewer inland locations. The proximity of the sea keeps it warmer in winter and more able to propagate.

The flowers are all initially en-wrapped within two white papery bracts, which open to reveal between three and 15 drooping trumpet-shaped flowers on stalks that are longer than are the flowers. Like all alliums, grows from a bulb. The fruit is green, between 4mm and 6mm across and globular. The seeds within are black, oblong and between 2mm - 3mm long.

When damaged, smells of garlic. Both leaves and bulbs can be eaten, although they are moderately poisonous if eaten to excess, especially to dogs.

Like many Allium species Three-Cornered Garlic contains Cystein Sulphoxides such as Methiin, Alliin, Isoalliin and Propiin, with the first three dominating.

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