I have a cutting grown Brugmansia...'Peaches n' Cream.' It's one year old in a large pot (15" x 14"). It looks healthy. I water every day, and fertilize often (Miracle Grow). Why doesn't it bloom? It's about 2 ft. tall and has many healthy leaves.
Certified GKH Gardening Expert
You may be adding to much Nitrogen which will make lush green plants and no flowers.
Adding Phosphorous will help. Bone Meal is a way to do this.
Here are some links for you.