Plant encyclopedia›common knapweed

common knapweed

Also known as: 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

An upright, branching perennial to 75cm, with simple or pinnately lobed leaves and thistle-like purple flowerheads to 4cm across, with conspicuous blackish involucres

Scientific classification

Species: common knapweed (Centaurea nigra)
Genus: Centaurea
Family: Asteraceae

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Toxicity: Herbaceous Perennial
Plant type: 0.5-1 metres
Height: 0.1-0.5 metres
Spread: Deciduous
Foliage: Clump forming
Habit: Spring · Summer · Autumn
Season of interest: Full sun · Partial shade
Sunlight: Information to be completed
Ideal temperature

common knapweed pictures

Distribution of common knapweed

Distribution map

NW to Central Europe

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Culture

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Toxicity

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Quick identification of common knapweed

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common knapweed care guide

Moderate regular watering, allowing brief slight drying between soakings
Watering: Full sun · Partial shade
Sunlight: Information to be completed
Ideal temperature

Watering

Moderate regular watering, allowing brief slight drying between soakings

Fertilizing

Balanced perennial feed every four weeks from spring through summer

Pruning

No pruning required

Propagation

Propagate by seed

Growing

Prefers a well-drained fertile soil in a sunny position. Tolerant of dry, alkaline soils and established plants are tolerant of considerable neglect. Self-seeds readily and can become invasive

More growing and care information →