Zingiber mioga

Yes, a hardy edible ginger! Japanese folk eat the fresh young shoots and even the flower buds, especially pickled (yum), though you'll probably want to leave them for their exotic effect in the garden. This woodlander sends stems of luscious foliage to 80cm and in autumn small, orchid-like, pale yellow flowers are seen at ground level. For good humusy soil in semi-shade. Hardy, even without a winter mulch.