Native to Europe and Asia, and widely naturalised elsewhere, including North America, where it is an invasive problem weed. a very woody herbaceous perennial vine, which scrambles over other plants, capable of reaching a height of 4 m where suitable support is available, but more often 1–2 m high. The leaves are 4–12 cm long, roughly arrowhead-shaped, and often lobed at the base. The flowers are in loose clusters of 3–20, 1–1.5 cm across, star-shaped, with five purple petals and yellow stamens and style pointing forward. The fruit is an ovoid red berry about 1 cm long, soft and juicy, with the aspect and odour of a tiny tomato, and edible for some birds, which disperse the seeds widely. However, the berry is poisonous to humans and livestock, and the berry’s attractive and familiar look make it dangerous for children.
It is native to northern Africa, Europe, and Asia, but has spread throughout the world. The plant is relatively important in the diet of some species of birds such as European thrushes, which feed on its fruits, being immune to its poisons, and scatter the seeds abroad. It grows in all types of terrain with a preference for wetlands and the understory of riparian forests. Along with other climbers, it creates a dark and impenetrable shelter for varied animals. The plant grows well in dark areas in places where it can receive the light of morning or afternoon. An area receiving bright light for many hours reduces their development. It grows more easily in rich wet soils with plenty of nitrogen.