What Is a Thorn Apple?

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Depending on the species, thorn apples are either perennial or annual, and have large, gray-green leaves with an unpleasant odor. Plants range from about 1 1/2 to 5 feet tall, with many branches for a spreading growth habit. Most grow in open, disturbed places such as roadsides, ditches, fields and vacant lots. The perennial species come from tropical and subtropical climates and don`t tolerate temperatures much below freezing. Because fresh thorn apple leaves taste bad to herbivores, most animals avoid eating the plants. One of the most common thorn apples is also called jimsonweed (Datura stramonium). This annual grows throughout the United States as a weed.

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The flowers of thorn apples are what make them garden subjects. The large, usually white flowers are night-blooming, held well above the leaves to attract pollinating moths. Some species have a purple throat, or are tinged with purple. Others have purple, pink or yellow flowers. On a large plant, many flowers can be open at the same time, all emitting a sweet fragrance. They only last one day. Another common name given to thorn apple thanks to these conspicuous flowers is devil`s trumpet or angel`s trumpet.

If pollinated, a green, softly spined round fruit begins to form at the base of the flower. As it matures, it becomes dry and brown, and the spines are hard and sharp. The round fruit eventually splits open, revealing hundreds of brown or black seeds that resemble tomato seeds. The seeds are more poisonous than other plant parts. The active toxins in thorn apples are alkaloids such as atropine, scopolamine and hyoscyamine. They affect the central nervous system and the action of voluntary and involuntary muscles.

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Allow enough room for thorn apple to spread out in the garden. They will overgrow nearby smaller plants- for example, the sacred thorn apple (Datura wrightii), can spread 15 to 20 feet wide under favorable conditions. Sacred thorn apple is an annual in cold winter areas and a short-lived perennial in U.S. Department of Agriculture plant hardiness zones 9 through 11. Blooming from spring into fall, the white flowers can reach 8 inches wide. A species that contains double-flowered cultivars, downy thorn apple (Datura metel) also has varieties with different flower colors, ranging from white to yellow, purple and pink. Hardy in USDA zones 9 through 11, it`s grown as an annual elsewhere. Use thorn apples in xeriscape gardens or in flowerbeds, giving them sun to partial shade.