Jimson weed (Datura stramonium) belongs to Solanaceae (the Nightshade family). It is an annual herb that is unclear about its native range. It was introduced into Japan in the early Meiji Era (about 140 years ago). This herb grows in roadsides and barrens, and can reach 90-150 cm in height. The leaves are ovate, irregularly undulate and coarsely toothed. The flowers are trumpet-shaped, white to creamy or violet, and bloom in summer. All parts of plants contain poisonous alkaloid and may be fatal if ingested by humans or animals.