"I am growing two different varieties this year, but have not documented them as well. Too busy with other projects."
Apparently every perpetrator of the tree potato growing dogma has the same excuse. Long stolons do not translate into vertical potatoes from what I have observed. Your pictures are not convincing of anything positive.
One would imagine that at least one well documented case of vertical potatoes would appear on the internet. There is not one demonstration of such.
My documentation of how a potato grows is absolutely fool proof. The other potatoes grown in my garden reflect no off stem formation of potatoes with normal hilling.
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