"To grow bittersweet vines or not to grow bittersweet vines: truly a bittersweet decision for landscapers."

"There are two vines with yellow and orange berries commonly called "bittersweet." They look very much alike.
One, an innocuous vine indigenous to North America with smooth stems, is Celastrus scandens, also called "American bittersweet" plant or "false bittersweet."
The other, an exotic vine that is among North America's most invasive plants and whose stem bears blunt thorns, is Celastrus orbiculatus, or "oriental bittersweet" vine."

Here is a link that might be useful: More info about bittersweet