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Once your plants are 6 to 8Once your plants are 6 to 8 inches tall, hoe extra soil loosely around the base of the plant -- to within about 1 inch of the lower leaves from both sides of the row. Repeat in about 2 to 3 weeks. You "hill" the soil so that water doesn’t puddle around the seed. As the vines grow, mound up soil, covering the vine with just the tip remaining above the top of the mound. Do this until the mound is about 12 inches tall. Potato tubers develop above the planted seed piece, not below it. This is why tubers need to be covered with soil at all times.

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