How dried out are they? If they have totaly dryed out, then they are dead and will not grow again. I've grown canna for many long years and have lost a few to being dryed out to much.
-- "In this universe the night was falling,the shadows were lengthening towards an east that would not know another dawn. But elsewhere the stars were still young and the light of morning lingered: and along the path he once had followed, man would one day go again."
Arthur C. Clarke, The City & The Stars