I have a big pot on my balcony that has inhabited many kinds of plants over the years. One spring I got to unexpected sprouts from seeds the size of an apple or orange seed. One survived and grew to what is depicted in the pictures here, but then unfortunately I got an infestation of spider mites that killed it.
I had previously rented out the apartment, and I suspect that this is the result of a couple of seeds that they intentionally or unintentionally put here. My best guess is that this is some kind of berry or something else edible that you buy in a grocery store.
You can also see some sun damage on some of the leaves in the picture. The plant in question is the most visible in the pictures, the others in the packground are passion fruit.
There were no thorns, and the leaves felt a little bit hairy, kind of like a common nettle but shorter and a fussier feeling. The height in the pictures is about 30-40 cm and it was growing fast until the spider mite attack.
What could it be?