Three-cornered Garlic

Three Cornered Garlic.

Common name

Three-cornered Garlic

Scientific Name

Allium triquetrum

Type of plant

Bulbs or Corms

About this weed

This perennial herb is originally from Europe and North Africa and is a member of the ‘Onion’ family. It is another garden escapee and has a distinctive three-cornered stem – hence the common name. By 1909 it had become naturalised in South Australia.


Three-cornered Garlic is another of the perennial, weedy bulbs. It can grow to about 0.3 m high and produces drooping, white bell shaped flowers that are held aloft on a stalk. It flowers from late winter to early spring. Reproduction is by offsets and seed and then dispersed by water, soil and possibly ants. The time to first flowering is 2 years and the seedbank persists for 1 to 5 years. This bulb generally survives fire.

Impact on Bushland

If left will spread into bushland and compete with native plant communities. It has the potential to become a serious bushland weed as it can soon dominate the ground layer.


It likes moist soils and is generally found in the wetter areas of the South-West Province usually around settled areas, creeklines and granite rocks.

Priority for removal

High: major threat to the conservation values in areas of higher rainfall in the South-West Province.

Management (hand)

Not available – but care should be taken if trying to remove plants manually to ensure all bulbs are removed.

Management (herbicide)

Spot spray metsulfuron methyl 0.2 g/15 L + Pulse® (or 2.5 – 5g /ha + Pulse®) or 2,2 DPA 5 g/L+ Pulse®. Apply just on flowering at bulb exhaustion. Optimum spraying months are June and July. Read the manufacturers’ labels and material safety data sheets before using herbicides.

Flowering month/s

August, September, October

Flower colour/s


Information source

Additional information

Hussey, B.M.J., Keighery, G.J., Dodd, J., Lloyd, S.G. and Cousens, R.D. (2007) Western weeds. A guide to the weeds of Western Australia, Second Edition, The Weeds Society of Western Australia, Victoria Park, Western Australia.

Three-cornered Garlic images


Donations and support from the wider community help us to protect and campaign for our Urban Bushland.

Make a donation

newsletter Signup

Get the latest news and key events delivered to your inbox.

Become a Member

We are a peak environmental group in WA. One of our key strengths is our amazing group and individual members.

Become member

Urban Bushland Council WA Inc

2 Delhi Street West Perth WA 6005

PO Box 326 West Perth WA 6872

(08) 9420 7207 (please leave a message)

Send this to a friend