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Habitat : Artemisia annua is native to temperate Asia, but naturalized throughout the world.
It occurs naturally as part of a steppe vegetation in the northern parts of Chahar and Suiyuan provinces in China, at 1000 to 1500 m above sea level.
Artemisia annua has fern-like leaves, bright yellow flowers, and a camphor-like scent. Its height averages about 2 m tall, and the plant has a single stem, alternating branches, and alternating leaves which range 2.5–5 cm in length. It is cross-pollinated by wind or insects. It is a diploid plant with chromosome number, 2n=18
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An easily grown plant, succeeding in a well-drained circumneutral or slightly alkaline loamy soil, preferring a sunny position. Plants are longer lived, more hardy and more aromatic when they are grown in a poor dry soil. A fast-growing annual plant, it is tall but neat in habit with a handsome fragrant foliage and is useful for filling gaps at the back of a border. It has become a weed of waste places in many areas of the world. The plant is extremely vigorous and essentially disease and pest free. Qing Hao is a determinate short-day plant. Non-juvenile plants are very responsive to photoperiodic stimulus and flower about two weeks after induction. The critical photoperiod seems to be about 13.5 hours, but there are likely to be photoperiod x temperature interactions. In Lafayette Indiana, USA (40°21’N) plants flower in early September with mature seeds produced in October. The plant is not adapted to the tropics because flowering will be induced when the plants are very small. Most collections of artemisia derive from natural stands with highly variable artemisinin content, some as low of 0.01%. Selections from Chinese origin vary from 0.05 to 0.21%. Swiss researcher N. Delabays reports a clonal selection derived from Chinese material which produces 1.1% artemisin but is very late flowering; proprietary hybrids have been obtained with somewhat lower content but flower earlier. Members of this genus are rarely if ever troubled by browsing deer.
Seed – sow spring in a cold frame and plant out in late spring or early summer. Alternatively, the seed can be sown late spring in situ
Edible Uses: An essential oil in the leaves is used as a flavouring in spirits such as vermouth.
Qing Ho, better known in the West as sweet wormwood, is a traditional Chinese herbal medicine. An aromatic anti-bacterial plant, recent research has shown that it destroys malarial parasites, lowers fevers and checks bleeding. Also used for heat stroke. Used as an infusion. Externally the leaves are poulticed for nose bleeds, bleeding rashes, and sores. Research in Thailand and the US shows that A. annua, in the preparation Artesunate, is an effective antimalarial against drug-resistant strains of the disease. Clinical trials have shown it to be 90% effective and more successful than standard drugs. In a trial of 2000 patients, all were cured of the disease. The seeds are used in the treatment of flatulence, indigestion and night sweats.
Indications: summer colds, sweatless fevers, malaria, nocturnal sweats, heat excess. An excellent refrigerant remedy in ailments of “empty-hot” excess.
Sweet Wormwood was used by Chinese herbalists in ancient times to treat fever, but had fallen out of common use, but was rediscovered in 1970’s when the Chinese Handbook of Prescriptions for Emergency Treatments (340 AD) was found. This pharmacopeia contained recipes for a tea from dried leaves, prescribed for fevers (not specifically malaria).
Essential; Herbicide; Miscellany.
The plant is used in China as a medium for growing Aspergillus which is used in brewing wine. The substances mentioned above in the medicinal uses, used in the treatment of malaria, also show marked herbicidal activity. The plant yields 0.3% essential oi. This has an agreeable, refreshing and slightly balsamic odour and has been used in perfumery.
Known Hazards : Skin contact with the plant can cause dermatitis or other allergic reactions in some people. The pollen is extremely allergenic.
Disclaimer:The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider
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