You can do either. It won't hurt it, since it forms blooms along its stems.

thanks! I'm replacing the arbor that it's on and I didn't want to kill the trumpet vine.

dont let it set seed, you will have it EVERYWHERE. and i think it grows from under ground runners as well. by no means am i trying to get you worried, just a word of caution. i did have hummingbirds which was nice but i had more wasps on it then birds. and it also was determined to take down the support it was on. good luck with it.

Trumpet Vine once the desired frame is grown needs quite short winter pruning. Like Wisteria or Grapes. If strong growing it does need this as a taming.

Pierre Rutten

I have some growing up a shade tree in my front yard, I never planted it there. It won't hurt the tree, will it?

Prune it with a flame thrower while you still can!