greater knapweed
Also known as: black top
An upright perennial to 75cm, with pinnately lobed leaves and reddish-purple flowers heads to 5cm across, usually with enlarged outer florets
Scientific classification
- Species
- greater knapweed (Centaurea scabiosa)
- 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
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- Ideal temperature
greater knapweed pictures
Distribution of greater knapweed
Distribution map
Europe
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Culture
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Toxicity
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Quick identification of greater knapweed
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greater knapweed care guide
- Moderate regular watering, allowing brief slight drying between soakings
- Watering
- Full sun · Partial shade
- Sunlight
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- Ideal temperature
Watering
Moderate regular watering, allowing brief slight drying between soakings
Fertilizing
FertilizingBalanced perennial feed every four weeks from spring through summer
Pruning
PruningSelf-seeds readily so prune after flowering if seed is not required
Propagation
PropagationPropagate by seed in spring, or propagate by division in spring or autumn
Growing
GrowingPrefers well-drained soil in a sunny position. Especially tolerant of dry alkaline soils
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Common pests and diseases
Diseases
May be susceptible to Powdery mildews
Pests
Generally pest-free
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