Weed profile

Black Knapweed

Centaurea nigra

Family
Asteraceae
Origin
Europe
Type
SPState prohibited
Plant instead Wiry Bauera Bauera rubioides

Control methods

Non-chemical
What each method means

All parts of the plant are toxic and should not be ingested.

Herbicides must be applied at the appropriate rate as specified on the label and all safety precautions followed. If chemical control is necessary near drainage lines or streams, use extreme caution as the effects on aquatic life can be devastating even in minute amounts. Always seek expert advice.

Family, origin, type, plant instead, control methods and the note above are from SGLN’s pocket guide Common weeds of South Gippsland (2026).