I have heard of people using old tires and planting the potato, and then adding a tire, and filling with soil as the potato vine grows, and keep adding tires and soil. The idea is to have lots of potatoes from one plant. I never tried this, so I don't know if it really works. I do know that what sandy says works, as that's why I hill mine. I think the trench idea is good too, will have to try that. I have an attachment (looks like a V plow) for the back of my tiller that digs a trench.
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