Allium triquetrum | Three-cornered Garlic
Third Schedule listed species under Regulations 49 & 50 in the European Communities (Birds and Natural Habitats) Regulations 2011. (Note: Regulation 50 not yet enacted).
First reported in the wild
Invasive species - risk of Medium Impact
Introduction pathways - 1
Escape from Confinement
Introduction pathways subclass - 1
NAPRA Ireland risk assessed
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).
Pathway and vector description
Common garden escape (Reynolds, 2002) and human dispersal is likely the major pathway of expansion in Ireland. Widely available in the horticulture trade.
Mechanism of impact
Found along roadsides, field margins and other waster ground (Booy et al., 2015).
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 to Mediterranean Europe (Preston et al., 2002).
Date of first record category
Records submitted to Data Centre in 2019
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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.