Not trying to start an argument, just stateing that the "improved' varieties i.e. "commercial" varieties have had EXTENSIVE selection AGAINST the traits you are looking for. Saying that, there are THOUSANDS of varieties (mostly native peruvian types)that have not had these traits bred out. Both herm 18 and guincho negro will grow 6' stolons, and don't "nest" their tubers like MOST commercial varieties. As far as photo evidence....I will do my best.
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