Where best to buy brugmansia?

Mine are similar, leaves are dropping too, but just going to leave them as they are and see how I go this winter.

 

Yeah, they will need to winter in the green, ie. above about 5c min preferably, in a greenhouse if possible with full light, and kept just moist enough to stop the leaves drooping.

 

It already below 5C at night most nights already and they been living in the GH all summer until the frost nipped them . I just see how they go in the spare room , the heating barely on in that room.