I kept mine cut back, but only for the sake of space, not necessarily to shape them. However, the plants didn't seem to notice, as they continued to be beautiful. I have also found it's almost impossible to kill a Moonflower plant. Moonflowers, simply, will take up a lot of space. Next year mine will be farther from the house.

I had to extensively trim ours about 3 times and it did not hurt them a bit. They just kept blooming. I too will find a better place to plant those large beauties next year.

If you like more of a tree form like appearance. It can be single or multiple trunk by starting to thin
out some of the lower branches on the selected trunk. More pruning can be done in spring.

Ankrara's Hobby Corner

Thank you for sharing that information! sort of like a bonzai! i believe i will try this next year!