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The stalk of the new potato grows from the eye, and it has to grow upward in order to reach the sunlight. If you planted it with the eye facing down, it would only have to curve around in order to grow upward, and that would be a pointless inefficiency.

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When freshly potato pieces are planted fresh, it invites disease and may rot. When the potatoes grow, the stem shoots upward. Planting them with the eye facing up helps guide potato seedlings so they can break through the soil upward the sun.

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Q: Why you have to plant the cut pieces with eye pointing upward?
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