Allium triquetrum, Angled Onion

Lilies and bulbs
Scientific Name
Allium triquetrum
Common Name/s
Angled Onion
Weed Information

Status: Declared Noxious Weed (Regionally Controlled).

Threat: High threat environmental weed.

Description: A 20–40cm tall tufted perennial lily-like herb. Upright strap-like leaves with drooping white flowers and three-angled stem. Foliage emerges from bulbs in mid to late autumn with flowering from late-winter to spring. The whole plant has a strong onion aroma.

Flowers: White with green veins, bell shaped, with six petals. Flowers grouped in a head in loose clusters on slender triangular stems. Flower stalks join stem at common point. Flowers from August to November then dies back over summer to bulbs. New bulb forms at side of old bulb at flowering.

Leaves: Limp, pointed at tip, v-shaped in cross-section, hairless, shining bright-green. Leaf bases wrap around the lower stem and bulb.

Fruits: Rounded capsules that split, with several black seeds in each capsule.

Note: Invades bushland, waterways and drainage lines and is capable of dominating the ground layer and impeding over-storey regeneration. It often occurs on moist soils. Seeds spread by ants and water. Bulbs spread in soil.

Control measures: Hand weeding, spot spraying, slashing, solarisation, scrape and paint with suitable herbicide.

Dispersal: Water, wind.