The ones I have look like the Stampede variety but I'm not completely sure. Even the knobby ones just need a good rinse and sometimes a toothbrush scrub. The peel is perfectly edible and probably contains some good nutrients. Here in Zone 9a/Central FL we're getting some plants that have produced almost 25lbs of tubers per season so even if you don't care to eat them your animals will. I'm going to experiment with making inulin syrup from these and the Yacons I'm growing.
