I know this is an old post but the plant is a pepino

one thing for sure.. its a shade plant.. as all begonia are .. it has high water needs.. and will continue to bloom if you pinch off spent flowers ... if there isnt a begonia forum ... try the perennial forum ... as its a little more active than the annual forum .... with high water needs.. usually humidity is an issue.. and that is where a lot of these things fail indoors .. if you run a hot air furnace all winter.. it might survive.. but it will be a challenge indoors in winter ... dad used to store the tubers dry for winter.. with some success ... ken

Other than the Fallopia/Polygonum cuspidatum group, I would not call any of them bad. Most of ours are native, they have their niches, they are quite important in some ecological communities. The wetland species provide a lot of seed for waterfowl. A few species are quite resilient and you see them dominating some disturbed habitats; it's not because they are invasive, it's just that they can grow in the mixture of concrete dust and dog dung that passes for soil in some urban settings.

looking down.. AND UPSIDE DOWN ... it does not please me to turn my head for sideways pix... but sorry.. i am not standing on my head for you .. lol ... sedum again .. from me ... ken