Centaurea nigra
| Centaurea nigra | |
| Light: |  |
| Moisture: |   |
| Hardiness: | 5 |
| Soil pH: | 5.6-8.4 |
| Self Pollinated | |
| Height: | 2' |
| Blooms: | Early Summer-Early Fall |
| Native to: | |
| Edible Rating: |  |
| Medicinal Rating: |  |
| Tea: | Yes |
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Centaurea nigra (common name: black knapweed)
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.
Cultivation: Succeeds in ordinary garden soil[1][2]. Prefers a well-drained fertile soil and a sunny position[2]. Tolerates dry, low fertility and alkaline soils[2]. 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[3].
Range: Western Europe, including Britain, from Spain to Norway, east to Germany and Switzerland.
Habitat: Grassland, waysides, cliffs etc to 600 metres[4].
Edibility: Flower petals - raw. Added to salads[5].
Medicinal: The roots and seeds are diaphoretic, diuretic, tonic and vulnerary[6][7]. The plant once had a very high reputation as a healer of wounds[6].
Pollinators: Bees, flies, lepidoptera, self
Soil: Can grow in light, medium, and heavy soils.
Drainage: Prefers well drained soil.
Seed Ripens: Late Summer-Mid Fall
Flower Type: Hermaphrodite
Links
References
- ↑ Chittendon, Fred. RHS Dictionary of Plants. Oxford University Press, 1951.
- ↑ 2.0 2.1 2.2 Huxley, Anthony. The New Royal Horticultural Society Dictionary of Gardening. MacMillan Press, 1992.
- ↑ Thomas, Graham. Perennial Garden Plants. J. M. Dent & Sons, 1990.
- ↑ Clapham, Arthur and Tom Tootin, Edmund Warburg. Flora of the British Isles. Cambridge University Press, 1962.
- ↑ Facciola, Stephen. Cornucopia - A Source Book of Edible Plants. Kampong Publications, 1990.
- ↑ 6.0 6.1 Grieve, Margaret. A Modern Herbal. Penguin, 1984.
- ↑ Usher, George. A Dictionary of Plants Used by Man. Constable, 1974.