Allium triquetrum has white, bell-like flowers in winter and spring; similar to snowdrop but with a strong onion smell. Fruit/Seeds in summer. Dispersal: Spreads mainly vegetatively from bulbs eg. through grading of roadsides. Invades: Water courses, roadsides, waste areas, coastal areas.
Manual control
Small Plants
Hand pull or use a garden fork ensuring removal of bulbs and adjoining corms and rhizomes.
Large Infestations
Remove flower heads prior to seed set, using either lawn mower or brush cutter.
Cover infested area with dense mulch matting (eg. Old carpet, thick newspaper), topped with appropriate mulch, after active growth, and leave to rot down.
Alternatively, cover with black plastic prior to seed set. Leave plants to ‘cook’ for several weeks or longer if possible before hand removing or spot spraying the weakened plants.
From SGLN’s 2017 weed guide.
