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Centaurea cyanus

Common name:	Cornflower	Family:	Compositae
Author:	L.	Botanical references:	17, 200
Synonyms:
Known Hazards:	None known
Range:	Most of Europe, including Britain, to the Near East.
Habitat:	Once a common weed of cornfields, as a result of modern agricultural practices it is now very rare in the wild[9, 13]. Found especially on porous, nutrient-rich soils[268].
Edibility Rating (1-5):	2	Medicinal Rating (1-5):	2

Other Possible Synonyms:	From various places across the web, may not be correct. See below.
	C. cyaneus[E] Leucacantha cyanus[B,P]
Other Common Names:	From various places around the Web, may not be correct. See below.
	A'Nber [E], Aciano [E], Bachelor's Button [L], Bachelor's Buttons [H], Blue Cap [H], Bluebottle [H,L], Bluebow [H], Cornflour [E], Cornflower [H,L], Garden Cornflower [P,B], Hurtsickle [H], Korenbloem [D], Mawi Pighember Chichegi [E], Peygamber Cicegi [E], Sentoria [E],
Epithets:	From a Dictionary of Botanical Epithets
	aurea = golden cyanus = blue
Systematics:	From a USDA Plants Database
	Order: Asterales. Renamed to Asteraceae -- Aster family
Other Range Info:	From the Ethnobotany Database
	Europe Iraq Spain Turkey
Noxious, Invasive and Injurious Weeds	From USDA PLANTS database, Weeds Australia , DEFRA Injurious Weeds
	Listed as noxious/invasive for: USA Invasive.

Physical Characteristics

Annual growing to 1m by 0.3m . It is not frost tender. It is in flower from June to August, and the seeds ripen from August to October. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees, flies and Lepidoptera (Moths & Butterflies). The plant is self-fertile. It is noted for attracting wildlife. We rate it 2/5 for edibility and 2/5 for medicinal use.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in nutritionally poor soil. The plant prefers acid, neutral and basic (alkaline) soils and can grow in very alkaline soil. It cannot grow in the shade. It requires dry or moist soil and can tolerate drought.

Habitats and Possible Locations

Cultivated Beds.

Edible Uses

Colouring Flowers.

The young shoots are edible[7].
Flowers - raw or cooked. The fresh florets can be used in salads[238]. They are used as a vegetable or a garnish[183].
An edible blue dye is obtained from the flowers, used for colouring sugar and confections[183].

Medicinal Uses

Disclaimer

Antipruritic Antirheumatic Antitussive Astringent Diuretic Emmenagogue Laxative Ophthalmic Purgative Tonic.

Cornflower has a long history of herbal use, though it is seldom employed nowadays. In France it is still used as a remedy for tired eyes, but opinions differ as to its efficacy[254, 268]. Traditionally it is said to work best on blue eyes, whilst Plantago major (great plantain) was used for brown eyes[268].
The dried flowers are antipruritic, antitussive, astringent, weakly diuretic, emmenagogue, ophthalmic, very mildly purgative, and tonic[4, 7, 9, 21, 201, 240]. An infusion can be used in the treatment of dropsy, constipation, or as a mouthwash for ulcers and bleeding gums[9, 238]. This infusion is also taken as a bitter tonic and stimulant, improving the digestion and possibly supporting the liver as well as improving resistance to infections[254]. A water distilled from the petals was formerly in repute as a remedy for weak eyes[4] and a soothing lotion for conjunctivitis[7, 240].
The seeds are used as a mild laxative for children[7, 254].
A decoction of the leaves is antirheumatic[7, 254].

Other Uses

Dye Hair Ink Pot-pourri.

A blue ink and a dye is obtained from the petals mixed with alum-water[4, 100, 115, 201]. The dye gives a lovely colour to linen, but it is transient[4].
The dried petals are used in pot-pourri in order to add colour[4, 268].
Extracts of the plant are added to hair shampoos and rinses[238].

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 drought tolerant[201].
A very ornamental plant[1], there are many named varieties[188]. The flowers are often used in dried-flower arrangements because they retain their colour well[7].
A good plant for bees, butterflies and moths[20, 30, 108]. The cornflower is considered to be a good companion, in small quantities, for cereal crops[18, 20], though another report says that its greedy roots deprive the cultivated plants of nutrients and its tough stem dulls the reaper's sickle[4].
Members of this genus are rarely if ever troubled by browsing deer[233].

Propagation

Seed - sow March in the greenhouse. When they are large enough to handle, prick the seedlings out into individual pots and plant them out in May.
The seed can also be sown in situ during April, whilst in areas where the winters are not too cold a sowing in situ during September will produce larger and earlier-flowering plants

Cultivars

'': There are some named forms for this species, but these have been developed for their ornamental value and not for their other uses. Unless you particularly require the special characteristics of any of these cultivars, we would generally recommend that you grow the natural species for its useful properties. We have, therefore, not listed the cultivars in this database[K].

Suppliers

For more details of plant suppliers please see our Suppliers Page which lists many more places to look.

Web References

Details of Medicinal Uses, Habitats, etc. in M. Grieve A Modern Herbal (1931) [4]
[H] Details of Scandanavian and European Common names in Henriette's names database
[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.
[B] Data (Latin & Common names, other references) from the BONAP's Synonymized Checklist of the Vascular Flora of the United States, Puerto Rico, and the Virgin Islands.
[C] Taxon data. from the CalFlora database.
Images from the CalPhoto database.
[PHARM] Phytochemical Data (common names, uses, countries) from Dr Duke's Phytochemical Database.
[G] Data (Common Names, Uses, Distribution) from the USDA/ARS NPGS's GRIN taxonomic database.
[P] Data. (uses, distribution, wetland) from the USDA'a Plants database.
[HP] Links, Photos, Suppliers from Hortiplex Plant Database

References for Centaurea cyaneus (a possible synonym).

[E] Ethnobotany Data (common names, uses, countries) from the Ethnobotany Database.

References for centaurea cyanus (a possible synonym).

[HP] PhotoFrom Henriette's plant pictures
[HP] PhotoFrom Henriette's plant pictures

See the PFAF Links Pages for other sources.

Also try Photos and info from the The Plants Database which has 14,000 images.

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[4] Grieve. A Modern Herbal. Penguin 1984 ISBN 0-14-046-440-9
Not so modern (1930's?) but lots of information, mainly temperate plants.

[7] Chiej. R. Encyclopaedia of Medicinal Plants. MacDonald 1984 ISBN 0-356-10541-5
Covers plants growing in Europe. Also gives other interesting information on the plants. Good photographs.

[9] Launert. E. Edible and Medicinal Plants. Hamlyn 1981 ISBN 0-600-37216-2
Covers plants in Europe. a drawing of each plant, quite a bit of interesting information.

[13] Triska. Dr. Hamlyn Encyclopaedia of Plants. Hamlyn 1975 ISBN 0-600-33545-3
Very interesting reading, giving some details of plant uses and quite a lot of folk-lore.

[17] Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962
A very comprehensive flora, the standard reference book but it has no pictures.

[18] Philbrick H. and Gregg R. B. Companion Plants. Watkins 1979
Details of beneficial and antagonistic relationships between neighbouring plants.

[20] Riotte. L. Companion Planting for Successful Gardening. Garden Way, Vermont, USA. 1978 ISBN 0-88266-064-0
Fairly good.

[21] Lust. J. The Herb Book. Bantam books 1983 ISBN 0-553-23827-2
Lots of information tightly crammed into a fairly small book.

[30] Carter D. Butterflies and Moths in Britain and Europe. Pan 1982 ISBN 0-330-26642-x
An excellent book on Lepidoptera, it also lists their favourite food plants.

[100] Polunin. O. Flowers of Europe - A Field Guide. Oxford University Press 1969 ISBN 0192176218
An excellent and well illustrated pocket guide for those with very large pockets. Also gives some details on plant uses.

[108] International Bee Research Association. Garden Plants Valuable to Bees. International Bee Research Association. 1981
The title says it all.

[115] Johnson. C. P. The Useful Plants of Great Britain.
Written about a hundred years ago, but still a very good guide to the useful plants of Britain.

[183] Facciola. S. Cornucopia - A Source Book of Edible Plants. Kampong Publications 1990 ISBN 0-9628087-0-9
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.

[188] Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990 ISBN 0-86318-386-7
Excellent range of photographs, some cultivation details but very little information on plant uses.

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[201] Allardice.P. A - Z of Companion Planting. Cassell Publishers Ltd. 1993 ISBN 0-304-34324-2
A well produced and very readable book.

[233] Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. 1990 ISBN 0 460 86048 8
A concise guide to a wide range of perennials. Lots of cultivation guides, very little on plant uses.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

[240] Chopra. R. N., Nayar. S. L. and Chopra. I. C. Glossary of Indian Medicinal Plants (Including the Supplement). Council of Scientific and Industrial Research, New Delhi. 1986
Very terse details of medicinal uses of plants with a wide range of references and details of research into the plants chemistry. Not for the casual reader.

[254] Chevallier. A. The Encyclopedia of Medicinal Plants Dorling Kindersley. London 1996 ISBN 9-780751-303148
An excellent guide to over 500 of the more well known medicinal herbs from around the world.

[268] Stuart. M. (Editor) The Encyclopedia of Herbs and Herbalism Orbis Publishing. London. 1979 ISBN 0-85613-067-2
Excellent herbal with good concise information on over 400 herbs.

Readers Comments

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