Can clematis vines be planted with bittersweet vines?

Question

Next spring, 2020, I would like to plant Sweet Autumn clematis vines so that they would grow and bloom amongst my bittersweet vines. Are they able to co-habitate? The bittersweet are well established and pruned regularly on 2 arbors. They do not produce the orange berries. This particular clematis is a vigorous grower and blooms late summer here in Iowa and would be cut back each early spring. I have one of these clematis in another spot in my yard and love it. Thanks for your advice.

Answer 1

I don't know that there's any specific research on this, but bittersweet can become invasive and is capable of killing surrounding plants and even trees. Sweet Autumn Clematis also has the propensity to take over so it might be a case of who beats who. Autumn clematis is on many thug lists, including mine. It almost took over my whole yard, by seed. I would prune it in the fall, before the seedheads disperse.

Here's an article: https://www.gardeningknowhow.com/ornamental/vines/bittersweet/oriental-bittersweet-control.htm