In article om,
says...
I bought a trumpet vine this summer and it is in a large pot. It has lots of
foliage but no blooms. What am I doing wrong? I live in Houston and
thought it would be a good blooming plant for an arbor but so far it has
not bloomed.

I think you are expecting things to happen a little too fast.
In the wild, a trumpet vine may spend several years climbing
a tall tree, and produce little more than foliage until it
reaches the canopy, where it sets in for serious reproduction.
Also it seems you are trying to constrain its size somewhat,
growing it in a pot, and I don't know how well that will work.
I am not sure if it will develop a robust enough root system.
Even if it is satisfied with its situation, I would not expect
blooms the first year. Start looking for that to happen more
like the third year.