[Wikipedia] Iberian Peninsula native: It is native to the Iberian Peninsula, especially frequent in the western half in central and northern interior Portugal[6] and central and northern western Spain.[7] It is better known as an introduced species on other continents, including Australia and North America, where it has become a weed in agricultural land and an invasive species in natural habitats. (link added by Mary Ann Machi)

[Wikipedia] Noxious weed: This plant is a serious noxious weed of agricultural fields and a colonizing invasive plant in wild lands in parts of Australia and California,[8] where it was first introduced as an ornamental shrub for its prolific white flowers. It is still sometimes grown and sold for landscaping purposes despite its status as a pest plant, with new industry and public education programs resulting (link added by Mary Ann Machi)