I've come into a 1/3 of 2 30-ft rows of potatoes. The people I'm gardening with are in some big @$#%^ hurry, and want to dig out the potatoes now. That's early, even for southern MN. Anyway, how am I going to store these potatoes? All of the root-cellar techniques mention that they should be harvested when the plants die off. Should I do anything different for an early harvest?