How To Grow Tea (Camellia Sinensis)

Channel: Thehowtogrowguy   |   2010/01/27
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From Wikipedia, the free encyclopedia
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Camellia sinensis
Camellia sinensis foliage
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Ericales
Family: Theaceae
Genus: Camellia
Species: C. sinensis
Binomial name
Camellia sinensis
(L.) Kuntze
Synonyms[1]
  • C. angustifolia Hung T. Chang
  • C. arborescens Hung T. Chang & F. L. Yu
  • C. assamica (J. W. Masters) Hung T. Chang
  • C. dehungensis Hung T. Chang & B. H. Chen
  • C. dishiensis F. C. Zhang et al.
  • C. longlingensis F. C. Zhang et al.
  • C. multisepala Hung T. Chang & Y. J. Tang
  • C. oleosa (Loureiro) Rehder
  • C. parvisepala Hung T. Chang.
  • C. parvisepaloides Hung T. Chang & H. S. Wang.
  • C. polyneura Hung T. Chang &
  • C. thea Link
  • C. theifera Griffith
  • C. waldeniae S. Y. Hu
  • Thea assamica J. W. Masters
  • Thea bohea L.
  • Thea cantonensis Loureiro
  • Thea chinensis Sims
  • Thea cochinchinensis Loureiro
  • Thea grandifolia Salisbury
  • Thea olearia Loureiro ex Gomes
  • Thea oleosa Loureiro
  • Thea parvifolia Salisbury (1796), not Hayata (1913)
  • Thea sinensis L.
  • Thea viridis L.
  • Theaphylla cantonensis (Loureiro) Rafinesque

Camellia sinensis is the species of plant whose leaves and leaf buds are used to produce the popular beverage tea. It is of the genus Camellia (Chinese: 茶花; pinyin: Cháhuā, literally: "tea flower"), a genus of flowering plants in the family Theaceae. White tea, yellow tea, green tea, oolong, pu-erh tea and black tea are all harvested from this species, but are processed differently to attain different levels of oxidation. Kukicha (twig tea) is also harvested from Camellia sinensis, but uses twigs and stems rather than leaves. Common names include tea plant, tea shrub, and tea tree (not to be confused with Melaleuca alternifolia, the source of tea tree oil).

There are two major varieties used for tea, Chinese tea, Camellia sinensis var. sinensis, and Assam tea, Camellia sinensis var. assamica.[2]

Nomenclature and taxonomy[edit]

The name Camellia is taken from the Latinized name of Rev. Georg Kamel,[3] SJ (1661–1706), a Czech-born Jesuit lay brother, pharmacist, and missionary to the Philippines. Carl Linnaeus chose his name in 1753 for the genus to honor Kamel's contributions to botany[4] (although Kamel did not discover or name this plant, or any Camellia,[5] and Linnaeus did not consider this plant a Camellia but a Thea).[6] Robert Sweet shifted all formerly Thea species to the Camellia genus in 1818.[7] The name sinensis means from China in Latin.

Four varieties of Camellia sinensis are recognized.[1] Of these, C. sinensis var. sinensis and C. sinensis var. assamica (JW Masters) Kitamura are most commonly used for tea, and C. sinensis var. pubilimba Hung T. Chang and C. sinensis var. dehungensis (Hung T. Chang & BH Chen) TL Ming are sometimes used locally.[1]

Cultivars[edit]

Cultivars of C. sinensis include:

Description[edit]

Camellia sinensis is native to East, South and Southeast Asia, but it is today cultivated across the world in tropical and subtropical regions. It is an evergreen shrub or small tree that is usually trimmed to below 2 m (6.6 ft) when cultivated for its leaves. It has a strong taproot. The flowers are yellow-white, 2.5–4 cm (0.98–1.57 in) in diameter, with 7 to 8 petals.

The seeds of Camellia sinensis and Camellia oleifera can be pressed to yield tea oil, a sweetish seasoning and cooking oil that should not be confused with tea tree oil, an essential oil that is used for medical and cosmetic purposes, and originates from the leaves of a different plant.

Camellia sinensis plant, with cross-section of the flower (lower left) and seeds (lower right).

The leaves are 4–15 cm (1.6–5.9 in) long and 2–5 cm (0.79–1.97 in) broad. Fresh leaves contain about 4% caffeine.[10] The young, light green leaves are preferably harvested for tea production; they have short white hairs on the underside. Older leaves are deeper green. Different leaf ages produce differing tea qualities, since their chemical compositions are different. Usually, the tip (bud) and the first two to three leaves are harvested for processing. This hand picking is repeated every one to two weeks.

Cultivation[edit]

Camellia sinensis is mainly cultivated in tropical and subtropical climates, in areas with at least 127 cm. (50 inches) of rainfall a year. Tea plants prefer a rich and moist growing location in full to part sun, and can be grown in USDA climate zones 7 - 9. However, the clonal one is commercially cultivated from the equator to as far north as Cornwall on the UK mainland.[11] Many high quality teas are grown at high elevations, up to 1,500 meters (4,900 feet), as the plants grow more slowly and acquire more flavour.

Tea plants will grow into a tree if left undisturbed, but cultivated plants are pruned to waist height for ease of plucking. Two principal varieties are used, the small-leaved Chinese variety plant (C. sinensis sinensis) and the large-leaved Assamese plant (C. sinensis assamica), used mainly for black tea.

Chinese teas[edit]

The Chinese plant (sometimes called C. sinensis var. sinensis) is a small-leafed bush with multiple stems that reaches a height of some 3 meters. It is native to southeast China. The first tea plant to be discovered, recorded and used to produce tea three thousand years ago, it yields some of the most popular teas.

C. sinensis var. waldenae was considered a different species, Camellia waldenae by SY Hu,[12] but it was later identified as a variety of C. sinensis.[13] This variety is commonly called Waldenae Camellia. It is seen on Sunset Peak and Tai Mo Shan in Hong Kong. It is also distributed in Guangxi Province, China.[12]

Indian teas[edit]

Tea plantations in Munnar, Kerala

There are three main kinds of tea produced in India:

Assam tea comes from the northeastern section of the country. This heavily forested region is home to much wildlife, including the rhinoceros. Tea from here is rich and full-bodied. It was in Assam that the first tea estate was established, in 1837.

Darjeeling – the Darjeeling region is cool and wet, and tucked in the foothills of the Himalayas. Tea plantations reach 2200 metres. The tea is delicately flavoured, and considered to be one of the finest teas in the world. The Darjeeling plantations have 3 distinct harvests, termed 'flushes', and the tea produced from each flush has a unique flavour. First (spring) flush teas are light and aromatic, while the second (summer) flush produces tea with a bit more bite. The third, or autumn flush gives a tea that is lesser in quality.

Nilgiris tea comes from a part of India that is almost as high as Darjeeling. This southern Indian region has elevations between 1,000 and 2,500 metres. The flavours of Nilgiris teas are subtle and rather gentle. They are frequently blended with other, more robust teas.

Seed bearing fruit of Camelia sinensis

Pests and diseases[edit]

Tea leaves are eaten by some herbivores, like the caterpillars of the willow beauty (Peribatodes rhomboidaria), a geometer moth.

Health effects[edit]

The leaves have been used in traditional Chinese medicine and other medical systems to treat asthma (functioning as a bronchodilator), angina pectoris, peripheral vascular disease, and coronary artery disease.

Recent medical research on tea (most of which has been on green tea) has revealed various health benefits, including anti-cancer potential, effects on cholesterol levels, antibacterial properties and positive effects for weight loss.[14] It is considered to have many positive health benefits due to tea's high levels of catechins, a type of antioxidant.

However, tea may have some negative impacts on health, such as over-consumption of caffeine, and the presence of fluoride and oxalates in tea.[citation needed]

See also[edit]

Notes and references[edit]

  1. ^ a b c Min, Tianlu; Bartholomew, Bruce. "18. Theaceae". Flora of China 12. 
  2. ^ ITIS Standard Report Page Camellia Sinensis retrieved 2009-03-28.
  3. ^ Stafleu, FA; Cowan, RS (1976–88). Taxonomic literature: A selective guide to botanical publications and collections with dates, commentaries and types (2nd ed.). Utrecht: Bohn, Scheltema and Holkema. 
  4. ^ "Botanics", History of Tea, 10 August 2003, "Georg Jeoseph Kamel, whose name in Latin was Camellus was missionary to the Philippines, died in Manilla in 1706. [...] Camellias were named in posthumous honor of George Joseph Kamel by Carolus Linnæus" .
  5. ^ "Botanics", History of Tea, 10 August 2003, "It is speculated that he never saw a camellia" .
  6. ^ Golender, Leonid (10 August 2003), "Botanics", History of Tea, "The first edition of Linnaeus's Species Plantarum published in 1753 suggested calling the tea plant Thea sinensis..." 
  7. ^ International Association for Plant Taxonomy (2006), "Article 13, example 3", International Code of Botanical Nomenclature (Vienna Code) (electronic ed.), "The generic names Thea L. (Sp. Pl.: 515. 24 Mai 1753), and Camellia L. (Sp. Pl.: 698. 16 August 1753; Gen. Pl., ed. 5: 311. 1754), are treated as having been published simultaneously on 1 May 1753. ... the combined genus bears the name Camellia, since Sweet (Hort. Suburb. Lond.: 157. 1818), who was the first to unite the two genera, chose that name, and cited Thea as a synonym" .
  8. ^ a b "Identification of Japanese tea (Camellia sinensis) cultivars using SSR marker". Food and Agriculture Organization. Retrieved 5 June 2009. 
  9. ^ a b c d e "Varietal differences in the adaptability of tea [Camellia sinensis] cultivars to light nitrogen application". Food and Agriculture Organization. Retrieved 5 June 2009. 
  10. ^ "Camellia sinensis". Purdue. Retrieved 18 February 2008. 
  11. ^ "Tea", Gardening, Telegraph Online, 17 September 2005 .
  12. ^ a b The International Camellia Society (ICS), DE: Uniklinik Sårland .[dead link]
  13. ^ Ming, TL (1992), "A revision of Camellia sect. Thea", Acta Botanica Yunnanica (in Chinese) 14 (2): 115–32 .
  14. ^ "Quick Sprints can Cut Abdominal Fat in Men". Retrieved 10 October 2012. 

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