i had a Brugmansia sanguinea "monica" that the roots went thru the bottom of the pot and survived and grew for several years protected under a Redwood tree
but 2 or 3 years ago we had snow for 3 days for the first time in 20 years i have been here and it didn't make it
i have another sanguinea in bloom as i type in the same location
and the 3 other brugs i have outside elsewhere have all lost there leaves
and are due to be cut and stored in the GH which has run out of room
all of my brugs are over 15 years old
