Are these hardy for you? Or do you bring them in?
This plants on the pictures are in big pots ...but the rest of them grows well in my borders
I have now Begonia grandis and relatives since more than 2 years free in the garden - they like it
(but we have a mild climate )
I do nothing extra - no protection in winter ...no extra watering in summer
This year was very dry ...no rain since end of August !