Glenna Sheaffer, a gardener at Kingwood Center in Mansfield, Ohio where I work has grown this ginger (Zingiber mioga) without winter protection for well over a decade. A few years ago she gave some to me and it has taken off in a rather shady spot. Growing over three feet tall it adds some hard to find bulk to the shade garden. It has the curious habit of flowering in the fall. See the picture below.