Hedychium

Oh goodness, but we all have our own rampant plants, just yours are more exotic than ours.

Looks lovely in clumps but not if it's rampent is it the self seeds that spread or the roots. If it's seeds chop the flowers off before they appear. I would dig it all up and place in pots on hard a standing by the house.

The tall grass in the back is also a pest. It is that weak invasive type that looks like bamboo.

Can you not dig all the root area up that contains the grass and ginger to kill them .

They are growing in a very rocky area, and any piece left behind will regrow. If I put a piece of the ginger on top of a stone wall, it just sprouts roots and carries on.

Bulldozer then lol.