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Botanical name: Centaurea nigra
Other names: Common knapweed, Lesser knapweed, Hardheads
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: Purplish-pink, Dark-purple in Summer
Foliage: Grey-green in Summer; Grey-green in Autumn
Pests: Generally pest free
Specific diseases: Powdery mildew
Pruning: Deadheading helps to prolong the flowering season.. REGISTER to read more...
Propagation methods: Division. REGISTER to read more...
Centaurea nigra (Common knapweed) will reach a height of 0.6m and a spread of 0.5m after 2-5 years.
Suggested uses: Coastal, Flower Arranging, Beds and borders, Containers, Wildflower, Wildlife
Cultivation: Grow in well-drained soil in full sun.
|This plant likes...||Garden match|
|Soil types:||Loamy, Sandy|
|Soil pH:||Acid, Alkaline, Neutral|
Discuss Centaurea nigra (Common knapweed) with other Shoot members.
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.
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