Allium triquetrum | Three-cornered Garlic | Glaschrreamh

Pre 2017

2017 - 2020


Conservation status

Not Assessed 

Legal status

Third Schedule listed species under Regulations 49 & 50 in the European Communities (Birds and Natural Habitats) Regulations 2011. (Note: Regulation 50 not yet enacted).

Species Biology


Bulbous perennial herb, 40-60cm tall, all parts smell of garlic, green narrow and flat leaves, white flowers, flowers early in the year with plants dying back completely by June and July (Booy, et al. 2015).


No impacts documented to date, can rapidly colonise and dominate waste ground outcompeting native vegetation (Booy et al., 2015).


Regularly or recently cultivated agricultural, horticultural or domestic habitat; Constructed, industrial or other artificial habitats; Miscellaneous


Seed dispersed by ants (Preston et al., 2002).

Habitat description

Found along roadsides, field margins and other waster ground (Booy et al., 2015).


World distribution(GBIF)

Irish distribution

Established - Widespread. More common in the south east than elsewhere, this may an artefact of recording effort or may be due to the less suitable climatic conditions in the rest of the country.

Native distribution

Native to Mediterranean Europe (Preston et al., 2002).

Temporal change

Records submitted to Data Centre in 2024

The following map is interactive. If you would prefer to view it full screen then click here.

How can you help

Report any sightings to the National Biodiversity Data Centre. Dispose of garden waste responsibly.



Reynolds, S.C.P. (2002) A catalogue of alien plants in Ireland. National Botanic Gardens. Glasnevin, Dublin. Stace, C. (1997). New Flora of the British Isles 2nd Edition. Cambridge University Press, Cambridge. Preston, C.D., Pearman, D. A. & Dines, T. D. 2002. New atlas of the British and Irish flora. An atlas of the vascular plants of Britain, Ireland, the Isle of Man and the Channel Islands, Oxford University Press. Booy, O., Wade, M. & Roy, H. (2015) A Field Guide to Invasive Plants & Animals in Britain. Bloomsbury.

NAPRA Risk Assessment of Allium triquetrum