Liriope (Liriope spp.)
Liriope is a clump forming, grass-like plant with glossy dark green leaves. It has spikes of small purple, violet or white flowers, followed by black, pea sized berries with one seed. It is a popular garden plant used extensively for its hardiness.
However, its origin is east Asia and it is starting to become a problem as it is spreading into local bushland. Seeds are spread by birds and water, also by dumping of garden waste.
Control: In the garden, cut flower heads before seeding. In bushland situations: Dig out plants ensuring any fruit/seeds are bagged, or foliar spray with herbicide.
For more information: https://sydneyweeds.org.au/weeds/liriopelily-turf/
Grow Me Instead
Blue flax lily – Dianella caerulea. A native hardy and very easy care clumping perennial plant, growing up to a metre high and wide. It has sprays of small blue flowers in spring.