I’ve wondered how anybody decided what wild-growing fruity things are good to eat. Look how long people thought tomatoes were poisonous. Do you feed them to dogs or feral cats first and see what happens?
There’s a public park not far from where I live with an unusual tree that I’ve not seen elsewhere. It is heavily laden with berries at a certain time of the year. The berries look exactly like boysenberries but are darker purple. (Like wild blackberries, but more elongated like boysenberries.)
I have no idea if they’re good to eat. I’m not about to try it. I never heard of any kind of berries that look anything like boysenberries, blackberries, or raspberries growing on a tree! I wonder if anyone has tried eating them, and if so, with what results?