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Beginner
skill rating |
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0.5m
max. spread |
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0.6m
max. height |
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2-5 years
to maturity |
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1 hour care
per year |
Botanical name: Centaurea nigra
Other names: Common knapweed, Lesser knapweed, Hardheads
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Genus: Centaurea
Species: C. nigra - C. nigra is an upright perennial with grey-green, hairy, lance shaped leaves. In summer it has spiky, dark purple-pink flowerheads on branched stems.
Centaurea nigra is: Deciduous
Flower: Dark-purple, Purplish-pink in Summer
Foliage: Grey-green in Summer; Grey-green in Autumn
Habit: Upright
Centaurea nigra (Common knapweed) will reach a height of 0.6m and a spread of 0.5m after 2-5 years.
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Suggested uses: Coastal, Flower Arranging, Beds and borders, Containers, Wildflower, Wildlife
Cultivation: Grow in well-drained soil in full sun.
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| Soil types: |
Loamy, Sandy |
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| Soil drainage: |
Well-drained |
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| Soil pH: |
Acid, Alkaline, Neutral |
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| Light: |
Full Sun |
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| Aspect: |
South, West |
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| Exposure: |
Exposed, Sheltered |
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| Hardiness: |
Hardy (H4) |
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Discuss Centaurea nigra (Common knapweed) with other Shoot members.
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Comment from
Miriam Mesa-Villalba
Common knapweed is thistle-like in appearance but without spines. Its dark flowerheads with pink-purple flowers are very attractive to insects including hoverflies, bumble bees and a range of day-flying moths. Butterflies also love it and very few plants will attract more than this one.
- Views: 144
- Replies: 0
- Posted: Sun. 17th May 2009 15:04
We list 9 suppliers who tell us they sell Centaurea nigra (Common knapweed). In order to see the list you'll need to either register or log in as a full member.
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