Tropicals & Tender Perennials: Overwintering HOWTO?, 1 by

wrote:
I know people, that cut them down in all kinds of heights. If you want them to bloom as early as possibly next year it is best not to cut down below the Y. Brugmansia is funny in that way. If we for an example take a tree that has its Y 2 m above the ground and it is cut down to 1 m. it will have to grow further 1 m. before it form a new Y. Cut to the base it will have to grow 2 m. etc. I am not the best drawer, but let me make an illustration showing a cut below the Y :)

All this growing can take most of the outdoors season and the flowers come very late. On the other hand, if you only cut back in the flower region (above the Y) the time that the plant spend on growing is minimal and the flowers come early in the season and enables you to enjoy them sometimes from as early as in late June.