For many years now I have read that Akebia quinata is invasive in the United States. My understanding is that a plant must spread readily into wilderness, displace native flora and be difficult to control in order to be classed as invasive.
I've only seen this vine get out of hand once in my life. I went back to the place, a neighborhood lot, and saw that it had been successfully cleaned up.
I've never seen seedlings near one. I've never seen it running amok like asian wisteria left to escape and run all over the place tearing down trees.
Yet, it still has the reputation for being invasive. Can anyone tell me, please, are there documented problems with this vine? Places where it has naturalized or is wreaking havoc? If it is true, I really need to know and would appreciate links to data or the name of a state park having trouble with it, for example.
(I have moral reasons for wanting to know)