Adapted from Tarwyn Park Training’s “Learning from Plants” series
Common Names: Angled Onion, Three-Cornered Leek, Three-Cornered Garlic, Triangle Onion, Wild Garlic
Scientific Name: Allium triquetrum
Where in the Succession: Late Succession Accumulator
Onion Weed (Allium spp.) is a bulbous perennial plant from the same family as onions and garlic.
Native to the Mediterranean, it now thrives in regions like southern Australia due to its preference for mild, wet winters and warm, dry summers.
It reproduces both by seed and bulbs, making it an opportunistic and persistent species.
The plant is described as a late succession accumulator species, favouring moist, fertile, and recently disturbed sites with little competition.
It thrives in shaded or partially shaded areas with high soil moisture and good organic matter, such as in garden beds.
Managing Onion Weed:
- Minimising soil disturbance to reduce germination opportunities.
- Increasing organic matter to suppress growth and support more desirable plants.
- Mechanical intervention (e.g. mowing) timed during flowering when the plant is weakest.
- Encouraging competitive species to naturally suppress Onion Weed.
- Livestock use, though limited, can help manage biomass, but caution is advised due to potential tainting of meat/milk.
How to make use of your Onion Weed:
- As a soil indicator, it points to compacted soils with structural issues rather than chemical imbalances.
- Potential medicinal benefits inherited from the Allium family (e.g., antimicrobial, cholesterol-reducing, sulphur-rich).
- Culinary use: all parts are edible, often compared to spring onions.
Want to learn more? Sign up for the Tarwyn Park training newsletter here.
