← Species guide
Three-cornered leek
Moderate riskAllium triquetrum
Sometimes picked as wild garlic. It carpets shady verges, churchyards and hedge banks across west Swansea and Gower, replacing native bluebells and celandines.
How to identify it
- Triangular flower stem — roll it between your fingers and you feel three edges
- Drooping white bell flowers with a fine green stripe on each petal
- Strong onion smell when crushed
Why it matters
- Dense spring carpets exclude bluebells, wood anemone and celandine
- Very hard to remove once bulbs are established under hedges
How to control it
- Dig out the whole bulb cluster — snapping leaves off achieves nothing
- Bag and dispose of soil and bulbs as controlled waste
- Repeated glyphosate on leaves in late winter for large stands
