Ginger lily

Or Hedychium gardnerianum the Kahili ginger; which is apparently amongst the worst invasive weed species in the world  Of course it is.  We grow it at OGH.  It has been recognized as one of "The World's 100 Worst Invasive Alien Species".

In our climate I don't think we have much to worry about, but I'll to take care it doesn't escape.