Yacon (Polymnia edulis/Smallanthus sonchifolius) also gives higher yields when grown on inside until the end of the year in a large pot; however, it is much less day length sensitive than ulluco and oca…when I had a cold greenhouse, yacon would give at least as good a yield as this by October…
The sweet tasting tubers are becoming quite popular in recent years! Yacon is in the Asteraceae, the roots containing inulin like its edible tubered cousins Jerusalem artichoke and Dahlia.