Speak for only yerself Kemosabe
A cultish fetish is still a cultist fetish no matter how large the cult. "Native" is a daft, destructive, deranged, doomed and dangerous construct once extended beyond any plant or animal born in a location.
As I said - nearly any plant "native" to Britain is as fit to be considered part of similar natural local ecosystems here as any that crossed the land-bridge in the brief period of it's existence.
(and many beyond Britain, natch, though not necessarily including the Jap bindweed)
Anyway, this native butterfly babe magnet, the Buddie Bush, is bursting out all over.
Scientists are still identifying highly specialised invertebrates in Ireland specific to certain native trees, even in 2012. I wouldn't underestimate the level of adaptation here.