I have a 10 year old Catalpa tree on my property. Plenty of light and water yet no flowers.

Question

I prune it to about 20 feet .

Answer 1

Considering the tree normally gets 40 to 70 feet, I suspect the lack of blooms is due to excessive pruning.

Once mature, the tree only needs suckers removed or low growing branches that impede walkways.

https://www.gardeningknowhow.com/ornamental/trees/catalpa/catalpa-tree-planting.htm