I only average about 1.5 lbs per hill, which works out to about 10 lbs per 1 1lb of seed tubers (2.5 oz average.
I think this is fairly average. Due to a lot of factors, you can get up to 10 lbs per hill, but no variety I have ever grown has yielded more than about 5 lbs per hill any year.
All the factors mentioned above can affect yield.
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