Durgan,
Yukon gold does not show this trait, but is a great potato. I read your site and liked how you mulched them, so I did learn something there.
I am sure in Canada must exist different types of potato and perhaps one or two would have the potential for lateral growth. If you grow one as experimental feel free to post your results here. I am sure your techniques will make excellent yields, but so far those varieties you have been growing, and posting here several times, are just the commercial type behavior.
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Wendy
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