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Centaurea jacea - L.

Common Name Brown Knapweed
Family Asteraceae or Compositae
USDA hardiness 5-9
Known Hazards None known
Habitats Hedgerows, uncultivated land and waste ground[7].
Range Europe. Naturalized in Britain.
Edibility Rating    (1 of 5)
Other Uses    (0 of 5)
Weed Potential Yes
Medicinal Rating    (1 of 5)
Care
Fully Hardy Well drained soil Moist Soil Full sun
Centaurea jacea Brown Knapweed


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Centaurea jacea Brown Knapweed
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Summary


Physical Characteristics

 icon of manicon of flower
Centaurea jacea is a PERENNIAL growing to 0.6 m (2ft).
It is hardy to zone (UK) 6. It is in flower from August to September, and the seeds ripen from August to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees, flies, Lepidoptera (Moths & Butterflies). 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.

UK Hardiness Map US Hardiness Map

Synonyms

Habitats

 Hedgerow; Cultivated Beds;

Edible Uses

The young leaves are cooked as a vegetable [1b].

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.
Bitter  Diuretic  Ophthalmic  Stomachic  Tonic

The root is bitter tonic, diuretic and stomachic[7]. An excellent bitter for treating difficult digestive systems, it is still used in rural areas as a digestive and also to reduce the temperature of feverish children[7]. A distilled water made from the leaves is used as an eye lotion in the treatment of conjunctivitis[7].

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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]. Plants are suitable for the wild garden and for naturalising[200]. This species is hardy to at least -15°c[200]. Members of this genus are rarely if ever troubled by browsing deer[233].

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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

If available other names are mentioned here

Brown knapweed, brownray knapweed

Found In

Countries where the plant has been found are listed here if the information is available

Asia: Lebanon, Syria, Turkey. North America: Canada and USA. Europe: Albania, Austria, Finland, France, Hungary, Italy, Netherlands, Norway, Poland, Russian Federation, Spain, Sweden.

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.

This plant can be weedy or invasive. In Washington, USA it is a Class B noxious weed.

Conservation Status

IUCN Red List of Threatened Plants Status : This taxon has not yet been assessed.

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 knapweed12
Centaurea melitensisMaltese Star Thistle01
Centaurea montanaMountain Cornflower, Perennial cornflower, Mountain Bluet02
Centaurea nigraBlack Knapweed, Lesser knapweed12
Centaurea raphanina 10
Centaurea scabiosaGreater Knapweed02
Centaurea solstitialisSt. Barnaby's Thistle, Yellow star-thistle11

 

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Botanical References

17200

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