It is a native of Mexico , Canada and the U.S.A. It is used as a hedge in tribal villages. Wikipedia says that the flowers and berries are edible, but the rest of the plant is poisonous.
At first, the local butterflies did not recognise the flower and they were not pollinated. Now , the plant is besieged by pollinators and their predators, and there are bunches of dark berries .I forgot to ask the tribals whether they ate the fruit ,which I am scared to eat. I tasted one berry today, and it was nothing great.