tjs282
Stone \ Cold / Fish
Thing about invasive species is, there has to be somewhere they invaded fromI am surprised you encourage Rhododendrons. They are a problem invasive species here.
Rhododendrons appear to have originated in S/E Asia, and spread outwards from there. It's not much more of a hop from PNG and Australia, to NZ...
https://en.wikipedia.org/wiki/Rhododendron#Distribution_and_habitat