Leaf cupping in brugmansia
My brugmansia, several years overextended in same pot, has prominent leaf cupping on all new growth. Leaves cup downward all around the edge. I'm sure they need reporting and root pruning, etc., but I wonder if that is the cause?
All of that are good reasons for a planat's decline.
Pictures will help diagnose what might be occurring with your brugmansia. Please send at least 3 images: one of the plant in the pot and its surroundings; one of the plant, including how it enters the potting mix; and a close view of several affected leaves.
Also please add a few notes about the plant's care, among them the size of the pot; how it is watered & how often; and if how it is fertilized, the amount, kind, and frequency.
I look forward to receiving your images and notes.