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Centaurea nigra - L.
                 
Common Name Black Knapweed, Lesser knapweed
Family Asteraceae or Compositae
USDA hardiness 4-8
Known Hazards None known
Habitats Grassland, waysides, cliffs etc to 600 metres[17].
Range Western Europe, including Britain, from Spain to Norway, east to Germany and Switzerland.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Care
Fully Hardy Well drained soil Moist Soil Full sun

Summary

Centaurea nigra Black Knapweed, Lesser knapweed


http://commons.wikimedia.org/wiki/File:Centaurea_nigra_Sturm24.jpg
Centaurea nigra Black Knapweed, Lesser knapweed
http://commons.wikimedia.org/wiki/User:Xemenendura
   
Physical Characteristics
 icon of manicon of flower
Centaurea nigra is a PERENNIAL growing to 0.6 m (2ft).
It is hardy to zone (UK) 5 and is not frost tender. It is in flower from Jun to September, and the seeds ripen from Aug to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees, flies, lepidoptera, self.The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: acid, neutral and basic (alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

Synonyms

Habitats
 Meadow; Cultivated Beds;
Edible Uses
Edible Parts: Flowers.
Edible Uses:

Flower petals - raw. Added to salads[183].
Medicinal Uses


Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

Diaphoretic;  Diuretic;  Tonic.

The roots and seeds are diaphoretic, diuretic, tonic and vulnerary[4, 61]. The plant once had a very high reputation as a healer of wounds[4].
Other Uses
None known
Cultivation details
Succeeds in ordinary garden soil[1, 200]. Prefers a well-drained fertile soil and a sunny position[200]. Tolerates dry, low fertility and alkaline soils[200]. Established plants are tolerant of considerable neglect, thriving and even self-sowing in dense weed growth[K]. Members of this genus are rarely if ever troubled by browsing deer[233].
Propagation
Seed - sow April in a cold frame. When they are large enough to handle, prick the seedlings out into individual pots and plant them out into their permanent positions in the summer. Division in autumn. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the summer or following spring. This should be done at least once every three years in order to maintain the vigour of the plant. Basal cuttings in spring. Harvest the shoots when they are about 10 - 15cm long with plenty of underground stem. Pot them up into individual pots and keep them in light shade in a cold frame or greenhouse until they are rooting well. Plant them out in the summer.
Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Centaurea acaulis 00
Centaurea calcitrapaCommon Star Thistle, Red star-thistle11
Centaurea chamaerhaponticum 20
Centaurea cyanusCornflower, Garden cornflower, Blue Bottle, Cornflower22
Centaurea depressaIranian knapweed20
Centaurea ibericaIberian Star Thistle, Iberian knapweed10
Centaurea jaceaBrown Knapweed01
Centaurea melitensisMaltese Star Thistle01
Centaurea montanaMountain Cornflower, Perennial cornflower, Mountain Bluet02
Centaurea raphanina 10
Centaurea scabiosaGreater Knapweed02
Centaurea solstitialisSt. Barnaby's Thistle, Yellow star-thistle11
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Expert comment
 
Author
L.
Botanical References
17200
Links / References
For a list of references used on this page please go here
Readers comment
 
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Subject : Centaurea nigra  

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