On Tue, Jan 8, 2013 at 10:30 PM, Leo A. Martin <leo@possi.org> wrote: > And I would think most of Europe would be wonderful for it. > Despite the cool summers in parts of Europe, the plant only makes tubers when the day length is short. In many places, frost kills the plants before they have a chance to produce mature tubers. They grow great here in Berkeley but year's harvest is small for me because the yacon (Smallanthus sonchifolius) took most of their sunlight away. Nhu Berkeley, CA