1. Potatoes were apparently capable of easily growing in a lot of arid regions of China where they largely thought fallow and unable to grow any crops.
2. Potatoes also have significantly more nutrients than most crops at the time, so people on a steady diet of potatoes tended to live longer and healthier than those who didn't..
3. Ireland's potato famine was a direct result of a new farming technique designed to increase harvest yield. The problem was that very technique allowed potato blight to spread more efficiently through the crops. Some researchers had theorized that had the older farming techniques been kept, the famine would have been significantly reduced or avoided altogether.