Q.What Diameter Pot Do You Suggest for an Angel Trumpet Plant?
What diameter pot do you suggest for an Angel Trumpet plant?

Certified GKH Gardening Expert
It depends on the size. I have mine in a 20" diameter pot and it stays about 3 1/2 feet tall. If I were to put it in a larger pot it would grow bigger (which would make it harder to bring in and out).
The more important thing to consider would be if you can keep it well watered. They are water hogs. If you can water more often, you can use a smaller container. If you can only water once a day or so in summer, use a larger container.