Black nightshade is a native annual found throughout most of England but becoming rarer northwards and local in Wales. It is recorded up to 1,000 ft. Black nightshade is a plentiful and troublesome weed of agricultural and horticultural fields and gardens. It occurs on a wide range of soils but prefers soil rich in nitrogen.Black nightshade exhibits a high level of variability and several sub-species have been identified. Some populations have developed resistance to the triazine herbicide atrazine.