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Ailanthus altissima - (Mill.)Swingle.
Common Name Tree Of Heaven
Family Simaroubaceae
USDA hardiness 5-8
Known Hazards The plant is possibly poisonous[7, 20]. Male flowers have potentially allergenic pollen[200]. The leaves are toxic to domestic animals[269]. Gardeners who fell the tree may suffer rashes[269]. The odour of the foliage is intensely disagreeable and can cause headache and nausea, rhinitis and conjunctivitis[269].The pollen can cause hay fever[269].
Habitats Uplands[147].
Range E. Asia - China. Naturalized in Britain[17].
Edibility Rating  
Other Uses  
Weed Potential Yes
Medicinal Rating  
Fully Hardy Well drained soil Moist Soil Wet Soil Semi-shade Full sun

Bloom Color: Green. Main Bloom Time: Early spring, Late spring, Mid spring. Form: Upright or erect, Vase.

Ailanthus altissima Tree Of Heaven

Ailanthus altissima Tree Of Heaven
Physical Characteristics
 icon of manicon of lolypop
Ailanthus altissima is a deciduous Tree growing to 25 m (82ft) by 15 m (49ft) at a fast rate.
It is hardy to zone (UK) 7. It is in flower from Jul to August, and the seeds ripen from Sep to November. The flowers are dioecious (individual flowers are either male or female, but only one sex is to be found on any one plant so both male and female plants must be grown if seed is required) and are pollinated by Bees.The plant is not self-fertile.
Suitable for: light (sandy) and medium (loamy) soils and can grow in nutritionally poor soil. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry moist or wet soil and can tolerate drought. The plant is not wind tolerant.
It can tolerate atmospheric pollution.

A. glandulosa. Toxicodendron altissimum.

Woodland Garden Canopy; Hedge; Bog Garden;
Edible Uses
Edible Parts: Leaves.
Edible Uses:

Leaves - cooked[105]. Used as an emergency food in times of scarcity, they have an offensive odour[2, 177, 178]. Some caution is advised, see the notes above on toxicity.
Medicinal Uses

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Anthelmintic;  Antibacterial;  Anticonvulsant;  Antidiarrhoeal;  Antispasmodic;  Astringent;  Bitter;  Cardiac;  
Deobstruent;  Diuretic;  Emetic;  Emmenagogue;  Febrifuge;  Rubefacient.

The tree of heaven is not often used in Western herbal medicine, though it is more popular in the Orient. Various parts of the plant are used, though the bark is the part most commonly used - however, it contains a glycoside that has not been fully researched and so should be used with caution[7]. The root and stem bark are antispasmodic, astringent, bitter, cardiac depressant, diuretic, emetic, febrifuge, rubefacient and vermifuge[4, 61, 147, 176, 178, 218, 238]. The vermifuge properties do not act on round worms or earthworms[269]. A nauseatingly bitter herb, it is used internally to treat malaria and fevers, it also slows the heart rate and relaxes spasms[238]. It needs to be used under the supervision of a qualified practitioner since the bark readily causes vomiting[238]. In China, the bark is a popular remedy for dysentery and other complaints of the bowels[4]. In one clinical trial, 81 out of 82 patients were cured of dysentery when they were given this herb[254]. A tincture of the root-bark has been used successfully in the treatment of cardiac palpitations, asthma and epilepsy[4]. 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[269] The bark is harvested in the spring and dried for later use[7]. The leaves, bark of the trunk, and roots are put into a wash to treat parasitic ulcers, itch, and eruptions[269]. In Korea, the root bark is used in the treatment of coughs, gastric and intestinal upsets[269]. The stembark is emmenagogue[218]. The leaves are anthelmintic, astringent and deobstruent[218]. The fruit is used in the treatment of bloody stools and dysentery[218, 269]. They have also been used to treat ophthalmic diseases[269]. Extracts from the plant are bactericidal[218]. The tree is used in homeopathic remedies for cancer[269]. A resin extracted from the roots and leaves is a revulsive or vesicant[269].
Other Uses
Dye;  Hedge;  Hedge;  Herbicide;  Insecticide;  Repellent;  Soil reclamation;  Soil stabilization;  Tannin;  Wood.

A yellow dye is obtained from the leaves[7]. The leaves contain 12% tannin, quercetin, as well as isoquercetin, and the alkaloid linuthine[218, 269]. The leaves and wood are high in cellulose and are used in paper-making[7, 74]. The crushed leaves and flowers are insect-repellent[14]. The plant parts, when steeped in water, are said to yield an insecticidal solution[218, 269]. An aqueous extract of the leaves contains a substance that is toxic to other tree seedlings[240]. When plants are put into marshy areas they drain the soil and thereby remove mosquito breeding sites[254]. The plants have extensive root systems and sucker freely, they can be used in soil-stabilization programmes[149]. Since the plant is tolerant of soil pollution it can also be used in land reclamation schemes on old mine tips etc[200]. Plants can be grown as a tall hedge[14]. 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[4, 46, 149, 178, 269]. Yields of 20 cubic metres per hectare is possible for this light wood[269].
Cultivation details
Landscape Uses:Pest tolerant, Aggressive surface roots possible. A very tough and easily grown tree, succeeding under most conditions, the Tree of Heaven is resistant to most diseases and is also reported to be tolerant of alkalinity, drought, frost, heat, high pH, hydrogen fluoride, low pH, pollution, SO2, poor, dry or wet soils, heavily polluted soils and industrial pollution[200, 269]. The plant prefers a light moist soil and a sheltered position[1, 133]. Prefers a position in full sun or partial shade[238]. 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[269]. Plants are hardy to at least -15°c[200]. A very ornamental tree, it has a somewhat tropical appearance and is fast growing when young[1, 7, 14], though it is rather short-lived[229]. The trees send up suckers freely and soon form dense thickets[7, 200, 229]. The plant has become a noxious weed in parts of Australia and is rather weed-like in many other countries[238, 269]. The roots are rather aggressive and can cause damage to drainage systems[226]. The plants thrive even when growing in very polluted cities[11, 229] and so have been used as street trees and as shade-trees in parks[268], they do not do well in the north of Britain, however[98]. Male flowers are malodorous and have potentially allergenic pollen[80, 200]. The crushed leaves are also malodorous[226]. The large leaves have glandular teeth near their base and these release a pungent aroma when pressed[245]. The disagreeable odour of the plant may cause some people to feel sleepy[269]. This tree is occasionally cultivated for its wood[149]. This is brittle however, and branches are very liable to break off in the wind[200]. Trees coppice readily[200]. The leaves were once used as a food for silkworms[2], but were found to be unsuitable[7]. This species is notably resistant to honey fungus[88, 200]. Dioecious. Male and female plants must be grown if seed is required[269]. Special Features:Not North American native, Invasive, Attractive flowers or blooms.
Seed - best sown outdoors as soon as it is ripe[78]. If you only have a small quantity of seed it will probably be better to sow it in a cold frame. The germination can be poor[80], averaging about 56%[98], though one kilo of seed will normally produce in the region of 6,500 usable plants[269]. The seed germinates best if given a short cold stratification of 8 weeks[80, 113]. The seed is not usually produced in Britain[80]. Prick out the seedlings into individual pots when they are large enough to handle, keep them in a cold frame for their first winter and plant them out in late spring[K]. Root cuttings in December[113]. Suckers, planted out in late winter.
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.

This plant can be weedy or invasive in Connecticut (tree of heaven) - Invasive, banned. Massachusetts (tree of heaven)- Prohibited. New Hampshire (tree of heaven) - Prohibited invasive Species. Vermont (tree of heaven) - Class B noxious weed. Moderat
Conservation Status
IUCN Red List of Threatened Plants Status : This taxon has not yet been assessed.
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Expert comment
Botanical References
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Readers comment
Elizabeth H.
Prof. Costas Cassios Sun Apr 13 06:04:17 2003
the tree behaves very good in forest fires when it grows in pine (aleppo pine) forest stands such as in southern Greece. The Ailanthus is used to cover firebelts in steep slopes and thus to eliminate erosion.In the reforestation plans with main species pines Ailanthus is used as a mixture species in a 10%(mainly seeds) and besides fire resistance adds because of the texture of the leaves and crown a better aesthetic appearance .
Elizabeth H.
Jasmina Muzinic Mon Sep 6 11:04:40 2004
Croatia is full of this plant. I don't know if Croatian Ministry of Forestry is aware of its spredding and problems that it caused. Jasmina Muzinic: jasmina@hazu.hr
Elizabeth H.
Ladislav Bakay Tue Jan 3 2006
Wood is used to make guitars, very nice sound. But its an agressive plant and we have "problems" with that as well in Slovakia.
Elizabeth H.
williams Wed Aug 23 2006
It's growing in a 70ft london garden and is at least 27 years old. Its proving to be a nuisance - blocking out sun & light and generates alot of debris.
Elizabeth H.
Mark. Gooley Wed Jun 11 2008
Hardy at least to zone 5 if not colder. Highly invasive in much of the USA at least, in my experience certainly in Illinois and in Boulder, Colorado. Legendary as "the tree that grows in Brooklyn" in the days of extreme urban pollution, ubiquitous in old mining towns in California where Chinese miners introduced it, perhaps for its medicinal value. I would think twice before planting it anywhere.
Elizabeth H.
wonder Sat Aug 23 2008
Has anyone actually eaten this plant? If so, does it retain its "foul odor" when cooked?
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Subject : Ailanthus altissima  

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