The leaves contain 12% tannin, quercetin, as well as isoquercetin, and the alkaloid linuthine. The leaves and wood are high in cellulose and are used in paper-making. The crushed leaves and flowers are insect-repellent. The plant parts, when steeped in water, are said to yield an insecticidal solution. An aqueous extract of the leaves contains a substance that is toxic to other tree seedlings. When plants are put into marshy areas they drain the soil and thereby remove mosquito breeding sites. The plants have extensive root systems and sucker freely, they can be used in soil-stabilization programmes. Since the plant is tolerant of soil pollution it can also be used in land reclamation schemes on old mine tips etc. Plants can be grown as a tall hedge.Wood - fairly hard, heavy, difficult to split, not durable, coarse grained. Though little used, except in poorer countries, the wood is suitable for cabinetry, cellulose manufacture, furniture, lumber, pulp, and woodwork. It is difficult to split but easy to work and polish. The wood is also used locally for charcoal and firewood. Yields of 20 cubic metres per hectare is possible for this light wood.
The root and stem bark are antispasmodic, astringent, bitter, cardiac depressant, diuretic, emetic, febrifuge, rubefacient and vermifuge. The vermifuge properties do not act on round worms or earthworms. A nauseatingly bitter herb, it is used internally to treat malaria and fevers, it also slows the heart rate and relaxes spasms. It needs to be used under the supervision of a qualified practitioner since the bark readily causes vomiting. In China, the bark is a popular remedy for dysentery and other complaints of the bowels. In one clinical trial, 81 out of 82 patients were cured of dysentery when they were given this herb. A tincture of the root-bark has been used successfully in the treatment of cardiac palpitations, asthma and epilepsy. Tree-of-heaven is a folk remedy for asthma, cancer, diarrhoea, dysentery, dysmenorrhoea, dysuria, ejaculation (premature), epilepsy, eruption, fever, gonorrhoea, haematochezia, leucorrhoea, malaria, metrorrhagia, sores, spasms, spermatorrhoea, stomachic, tumours of the breast (China), and wet dreams The bark is harvested in the spring and dried for later use. The leaves, bark of the trunk, and roots are put into a wash to treat parasitic ulcers, itch, and eruptions. In Korea, the root bark is used in the treatment of coughs, gastric and intestinal upsets. The stembark is emmenagogue. The leaves are anthelmintic, astringent and deobstruent. The fruit is used in the treatment of bloody stools and dysentery. They have also been used to treat ophthalmic diseases. Extracts from the plant are bactericidal. The tree is used in homeopathic remedies for cancer.A resin extracted from the roots and leaves is a revulsive or vesicant.
Root cuttings in December.Suckers, planted out in late winter.
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The tree is estimated to tolerate an annual precipitation of 30 to 250cm (tolerating a dry season up to 8 months), an annual average temperature of 10° to 20°C, and a pH of 5.5 to 8.0. Growing on the smallest of city plots and rubbish heaps, this species obviously can tolerate a wide array of soils, from acid to alkaline, sand to light clay, well-drained to swampy, poor to rich. It is said to do poorly on chalky soils or compact clay. Plants are hardy to at least -15°c. A very ornamental tree, it has a somewhat tropical appearance and is fast growing when young, though it is rather short-lived. The trees send up suckers freely and soon form dense thickets. The plant has become a noxious weed in parts of Australia and is rather weed-like in many other countries. The roots are rather aggressive and can cause damage to drainage systems. The plants thrive even when growing in very polluted cities and so have been used as street trees and as shade-trees in parks, they do not do well in the north of Britain, however. Male flowers are malodorous and have potentially allergenic pollen. The crushed leaves are also malodorous. The large leaves have glandular teeth near their base and these release a pungent aroma when pressed. The disagreeable odour of the plant may cause some people to feel sleepy. This tree is occasionally cultivated for its wood. This is brittle however, and branches are very liable to break off in the wind. Trees coppice readily. The leaves were once used as a food for silkworms, but were found to be unsuitable. This species is notably resistant to honey fungus.Dioecious. Male and female plants must be grown if seed is required.
Problems, pests & diseases
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