PlantFiles is getting a new look! Just in time for spring, we're rolling out a new look for the best online plants database. It will also work with your smart phones and mobile devices, so now you can take it with you on garden center visits or botanical garden tours. Questions or comments? Please post them here.

Three-cornered Garlic, Three-cornered Leek, Stinking Onions, Onion Weed
Allium triquetrum

Family: Alliaceae
Genus: Allium (AL-ee-um) (Info)
Species: triquetrum (try-KWET-rum) (Info)





6-12 in. (15-30 cm)

12-18 in. (30-45 cm)


Unknown - Tell us


USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Sun Exposure:

Light Shade

Partial to Full Shade



Bloom Color:

White/Near White

Bloom Time:

Mid Spring



Other details:

May be a noxious weed or invasive

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

By dividing rhizomes, tubers, corms or bulbs (including offsets)

From seed; direct sow outdoors in fall

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:

Alameda, California

Albany, California

Crescent City, California

Hayward, California

Redwood City, California

San Francisco, California

Winnetka, Illinois

Baton Rouge, Louisiana

Holly Springs, North Carolina

show all

Gardeners' Notes:


On Nov 17, 2009, mcrousse from Holly Springs, NC (Zone 7b) wrote:

This plant is hardy in my zone 7b so I am not sure how zone 10 came to be listed. At any rate, this is a beautiful little shade plant. It is a nice accent. The voles leave it alone, and it tolerates moist clay at the edge of my woods quite well. It has never been invasive for me; if anything I find I have to replace the plants every few years probably because of the clay. They are said to naturalize in good soil.


On Mar 9, 2008, Susan_C from Alameda, CA (Zone 9b) wrote:

A nasty weed in my garden. It is difficult to remove it all via hand pulling, and the tiniest bits left behind resprout. They can't be added to the compost pile, because composting won't kill them. (Learned that the hard way.) Weeding them out is an icky chore because they stink like the dickens. I will never be able to completely eradicate this plant, so have had to try to accept it and enjoy it when in bloom.


On Jun 6, 2006, WillowWasp from Jones Creek, TX (Zone 9a) wrote:

This plant is said to be Circa 1789, shade loving naturalizer with pendant creamy white bell shaped flowers with green veins.