Dhattura (Datura metel) Description of Plant Dhattura (Datura metel) is large, erect and stout an annual herb that grows up to 3 ft. high is known by the Thorn apple plant. It somewhat furry, having dark violet shoots with oval to broad oval leaves which are often dark violet as well. Leaves are simple, oval to broad oval in shape that are often dark violet in color and are alternate in arrangement. Flowers of this plant are large, greenish white