Is Bittersweet poison?
To a certain extent. For one thing, the berries are VERY BITTER. I can’t imagine anyone eating them as a snack. It is reported, though that they will make you sick if eaten. I know of no reports of a lethal ingestion. Birds, rabbits, and rodents will eat the berries as food. It does not bother them. House cats and dogs have been known to munch a little on the berries. Figure on cleaning up a not-too-pleasant mess if yours does.