So awhile back I dug up one of my potato plants and got a nice looking potato several weeks ago. I left the rest of the row. Today I needed a potato for dinner so I went to dig one up. It was rotten. I dug the whole row up. Each plant had about one potato and half of them were rotten. There were some other very small potatoes (about the size of a lg grape) but I do not think they will grow without the plant. Why would they rot like that?