Pic To Go With ‘What Is It’
Probably Alien to UK
Certified GKH Gardening Expert
This is Phytolacca esculenta. It is native worldwide, and can be considered quite invasive. Make sure that you don't eat the berries once they form. They are toxic.
This article will help: https://www.gardeningknowhow.com/edible/vegetables/pokeweed/controlling-pokeberry-plants.htm