Grooved ware is the name given to a pottery style of the British Neolithic. Its manufacturers are sometimes known as the Grooved ware people. Unlike the later Beaker ware, Grooved culture was not an import from the continent but seems to have developed in Orkney, early in the 3rd millennium BC, and was soon adopted in Britain and Ireland. Grooved ware pots excavated at Balfarg in Fife have been chemically analysed to determine their contents. It appears that some of the vessels there may have been used to hold black henbane (Hyoscyamus niger) which is a poison and a powerful hallucinogen.