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Citrus aurantium - L.
                 
Common Name Bitter Orange, Sour orange, Bergamot orange
Family Rutaceae
USDA hardiness 8-11
Known Hazards None known
Habitats Original habitat is obscure, possibly a back cross involving C. maxima X C. reticulata[200].
Range Tropical Asia?
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Care
Half Hardy Moist Soil Full sun

Summary

Citrus aurantium Bitter Orange,  Sour orange, Bergamot orange


http://commons.wikimedia.org/wiki/File:Koeh-042.jpg
Citrus aurantium Bitter Orange,  Sour orange, Bergamot orange
http://commons.wikimedia.org/wiki/User:BMK
   
Physical Characteristics
 icon of manicon of cone
Citrus aurantium is an evergreen Tree growing to 9 m (29ft) by 6 m (19ft).
It is hardy to zone (UK) 9 and is frost tender. It is in leaf 12-Jan It is in flower from Apr to June. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Apomictic, insects.The plant is self-fertile.
Suitable for: medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: acid and neutral soils and can grow in very alkaline soils.
It cannot grow in the shade. It prefers moist soil.

Synonyms
C. bigaradia.

Habitats
Woodland Garden Sunny Edge; Hedge; South Wall. By. West Wall. By.
Edible Uses
Edible Parts: Fruit;  Oil;  Oil.
Edible Uses: Condiment;  Oil;  Oil.

Fruit - raw or cooked[1, 3]. Very bitter[46]. It is used in making marmalade and other preserves[3, 46, 61, 183]. The fruit is about 5 - 7cm in diameter[200]. The rind of the fruit is often used as a flavouring in cakes etc[1, 4]. Used in 'bouquet garni'[183]. An oil obtained from the seeds contains linolenic acid and is becoming more widely used as a food because of its ability to reduce levels of cholesterol in the blood[7]. The flowers are used for scenting tea[183]. An essential oil from the dried peel of immature fruits is used as a food flavouring[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.

Antianxiety;  Antibacterial;  Antiemetic;  Antifungal;  Antispasmodic;  Antitussive;  Appetizer;  Aromatherapy;  
Carminative;  Contraceptive;  Diaphoretic;  Digestive;  Miscellany;  Sedative;  Stimulant;  
Stomachic;  Tonic;  Vitamin C.

Citrus species contain a wide range of active ingredients and research is still underway in finding uses for them. They are rich in vitamin C, flavonoids, acids and volatile oils. They also contain coumarins such as bergapten which sensitizes the skin to sunlight. Bergapten is sometimes added to tanning preparations since it promotes pigmentation in the skin, though it can cause dermatitis or allergic responses in some people[238]. Some of the plants more recent applications are as sources of anti-oxidants and chemical exfoliants in specialized cosmetics[238]. The plants also contain umbelliferone, which is antifungal, as well as essential oils that are antifungal and antibacterial[218]. They also contain the pyrone citrantin, which shows antifertility activity and was once used as a component of contraceptives[218]. Both the leaves and the flowers are antispasmodic, digestive and sedative[7, 9]. An infusion is used in the treatment of stomach problems, sluggish digestion etc[9]. The fruit is antiemetic, antitussive, carminative, diaphoretic, digestive and expectorant[218].The immature fruit can be used (called Zhi Shi in China) or the mature fruit with seeds and endocarp removed (called Zhi Ke). The immature fruit has a stronger action. They are used in the treatment of dyspepsia, constipation, abdominal distension, stuffy sensation in the chest, prolapse of the uterus, rectum and stomach[176]. The fruit peel is bitter, digestive and stomachic[7]. The seed and the pericarp are used in the treatment of anorexia, chest pains, colds, coughs etc[218]. The essential oil is used in aromatherapy. Its keyword is 'Radiance'[210]. It is used in treating depression, tension and skin problems[238].
Other Uses
Essential;  Hedge;  Hedge;  Miscellany;  Oil;  Oil;  Repellent;  Rootstock.

This species is much used as a rootstock for the sweet orange, C. sinensis, because of its disease resistance and greater hardiness[3, 46, 61]. Grown as a hedging plant in N. America[260]. A semi-drying oil obtained from the seed is used in soap making[46, 61]. Essential oils obtained from the peel, petals and leaves are used as a food flavouring and also in perfumery and medicines[1, 4, 46, 61, 171]. The oil from the flowers is called 'Neroli oil' - yields are very low from this species and so it is often adulterated with inferior oils[7]. The oil from the leaves and young shoots is called 'petit-grain' - 400 kilos of plant material yield about 1 kilo of oil[7]. This is also often adulterated with inferior products[7]. Neroli oil, mixed with vaseline, is used in India as a preventative against leeches[268].
Cultivation details
Prefers a moderately heavy loam with a generous amount of compost and sand added and a very sunny position[1, 200]. Prefers a pH between 5 and 6[200]. Tolerates a pH in the range 4.8 to 8.3. Plants are intolerant of water logging[200]. When growing plants in pots, a compost comprising equal quantities of loam and leafmould plus a little charcoal should produce good results[260]. Do not use manure since Citrus species dislike it[260]. When watering pot plants it is important to neither overwater or underwater since the plant will soon complain by turning yellow and dying. Water only when the compost is almost dry, but do not allow it to become completely dry[260]. Dormant plants can withstand temperatures down to about -6°c so long as this is preceded by cool weather in order to harden off the plant[200]. The young growth in spring, even on mature plants, is frost-tender and so it is best to grow the plants in a position sheltered from the early morning sun[K]. A tree grown outdoors on the coast at Salcombe in Devon lived for over 200 years[166]. The bitter orange is often grown for its edible fruit in warm temperate and tropical zones, there are many named varieties[183]. In Britain it can be grown in a pot that is placed outdoors in the summer and brought into a greenhouse during the winter[3, 200]. Plants dislike root disturbance and so should be placed into their permanent positions when young. If growing them in pots, great care must be exercised when potting them on into larger containers[238].
Propagation
The seed is best sown in a greenhouse as soon as it ripe after thoroughly rinsing it[164, 200]. Sow stored seed in March in a greenhouse[3]. Germination usually takes place within 2 - 3 weeks at 13°c. Seedlings are liable to damp off so they must be watered with care and kept well ventilated. The seed is usually polyembrionic, two or more seedlings arise from each seed and they are genetically identical to the parent but they do not usually carry any virus that might be present in the parent plant[200]. When large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for at least three growing seasons before trying them outdoors. Plant them out in the summer and give them some protection from the cold for their first few winters outdoors. Cuttings of half-ripe wood, July/August in a frame. Layering in October.
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
Citrus ichangensisIchang Papeda22
Citrus limonLemon45
Citrus reticulataMandarin, Tangerine, Unshu orange, Satsuma Orange,Temple Orange, Tangerine33
Citrus sinensisSweet Orange43
Citrus x meyeriLemon35
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Expert comment
 
Author
L.
Botanical References
200
Links / References
For a list of references used on this page please go here
Readers comment
 
Elizabeth H.
Lawrence Plaskett Sat Nov 19 2005
What is here is good but there is no mention of the use of this plant as a slimming aid, which is very topical just now. There is a need for an unbiased source of info about this
Elizabeth H.
Ruth Bull Wed Feb 4 2009
Why do Sevillec oranges only appear in the UK market in January/February? Is this when they ripen in Southern europe? Can they not be grown in a range of regions with a range of ripening dates? Or are they just not imported here except in the main season?
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Subject : Citrus aurantium  

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