when is pruning pink tabebuia best, after flowering or in the fall?

Question

The tree is about 12 feet tall, five years old, not a prolific bloomer like other Tabebuia in the neighborhood.

Answer 1

It isn't really necessary to prune them, as this will hold flowering off even more than it already it. It is only necessary to take out diseased or dead branches.

It is much more likely that your soil is lacking phosphorus and potassium, or is way to abundant in nitrogen. Correcting these issues will help with flowering.

This article will give you more information: https://www.gardeningknowhow.com/ornamental/trees/tabebuia-trumpet-tree/tabebuia-tree-care.htm