I've had a trumpet vine for about 3 growing seasons. The vine had flowers on it when I purchased it, but has never flowered since that first season. I have read that one should not fertilize the plant, so I haven't. It gets anywhere from 5 to 6 hours of sun and is doing well as a vine. What am I doing wrong?
Getting My Trumpet Vine to Flower
Certified GKH Gardening Expert
I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus.