Other common names
bell weed, black centaury, black knapweed, bowl weed, bull weed, button weed, churl's head, club weed, crop weed, hard weed, hardhead, hardheads, horse knops, horse knots, iron hard, iron heads, iron weed, knob weed, knot weed, lesser knapweed, loggerheads, nob weed, Spanish buttons, sweeps, tassel, pengaled
Herbaceous Perennial
A native, grassland branching perennial about 75-90cm, with simple or pinnately lobed leaves and thistle-like purple flowerheads to 4cm across, with conspicuous blackish bracts
Position
Full sun, Partial shade
Soil Types
Chalk, Clay, Loam, Sand
Max Height
0.5-1 metres
Max Spread
0.1-0.5 metres