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Common Name: Thorn Apple

General Information

Datura metel is an annual plant that can grow up to 1.50 metres tall.
It has edible and medicinal uses.

Known Hazards

All members of this genus contain narcotics and are very poisonous, even in small doses[, ].

Botanical References

Range

E. Asia - S. China, India. Naturalized in the Mediterranean.

Habitat

Waste places, river sands etc in sunny positions[, ]

Properties

Edibility Rating
Medicinal Rating
Habit	Annual
Height	1.50 m
Pollinators	Insects
Cultivation Status	Wild

Cultivation Details

Prefers a rich light sandy soil and an open sunny position[]. Grows best in a fertile calcareous soil[].
This species is extremely susceptible to the various viruses that afflict the potato family (Solanaceae), it can act as a centre of infection so should not be grown near potatoes or tomatoes[].
There are a number of named varieties selected for their ornamental value[]. The flowers have an exotic fragrance, though the bruised leaves have an unpleasant smell[].
This species is closely related to D. innoxia[].

Edible Uses

The leaves and roots are bruised, mixed with water and left to stand for several hours. The liquid is then drawn off and drunk. This is a highly narcotic drink, producing a stupefying effect that it is not easy to remove[]. Caution is advised, see the notes above on toxicity[].

Medicinal

The whole plant, but especially the leaves and seed, is anaesthetic, anodyne, antiasthmatic, antispasmodic, antitussive, bronchodilator, hallucinogenic, hypnotic and mydriatic[, , ]. It has a wide range of applications in India, including in the treatment of epilepsy, hysteria, insanity, heart diseases, fever with catarrh, diarrhoea, skin diseases etc[, ]. A poultice of the crushed leaves is used to relieve pain[]. In China, the plant is used in the treatment of asthma[]. In Vietnam, the dried flowers and leaves are cut into small chips and used in antiasthmatic cigarettes[]. Great caution is advised in the use of this plant since excess doses cause hallucinations, severe intoxication and death. The toxic dose is very close to the medicinal dose so this plant should only be used under the guidance of a qualified practitioner. See also the notes above on toxicity.
The plant contains the alkaloids hyoscyamine, hyoscine and atropine[]. Atropine dilates the pupils and is used in eye surgery[]. Total alkaloid content of the leaves is 0.426%, which is mainly atropine[]. The seeds contain 0.426% alkaloids, which is mainly hyoscyamine[]. The roots contain 0.35% hyoscyamine[].
An extract of the flowers is used as an anaesthetic - 3 - 5g applied orally produces a general anaesthesia within 5 minutes and lasting 5 - 6 hours[].

Other Uses

None known

Propagation

Sow the seed in individual pots in early spring in a greenhouse[]. Put 3 or 4 seeds in each pot and thin if necessary to the best plant. The seed usually germinates in 3 - 6 weeks at 15°c. Plant out in late spring or early summer, after the last expected frosts.
Especially in areas with hot summers, it is worthwhile trying a sowing outdoors in situ in mid to late spring.