when to cut bittersweet

Question

when is the optimal time to cut my bittersweet?

Answer 1

If you want to cut the decorative branches, you can do so whenever it has produced berries. If you want to prune it back, you should do so in late winter or early spring. Here's an article for you:
https://www.gardeningknowhow.com/ornamental/vines/bittersweet/growing-bittersweet-vines.htm