Source and 'Chit' Your Potatoes - Do this 2-4 weeks before planting
Avoid planting potatoes from the grocery store, as they are often treated with chemicals to prevent sprouting. Instead, buy certified "seed potatoes" from a garden center. Place them in an egg carton in a cool, bright room to encourage them to sprout short, stubby shoots (a process called "chitting").
Prepare Your Trench
Potatoes need loose, well-draining soil
Pick a spot in your garden that gets at least 6 hours of full sun a day. Dig a trench about 6 to 8 inches deep. If your soil is heavy clay, mix in plenty of compost so the growing tubers have soft earth to expand into.
Plant the Potatoes
Place your seed potatoes in the bottom of the trench with the sprouts pointing up, spacing them about 12 inches apart. Cover them with just 3 to 4 inches of soil for now, and water the trench well.
Hill the Plants
Crucial for preventing green, bitter potatoes
As the green leafy plants grow to about 8 inches tall, gently mound more soil (or straw) around the base of the stems, burying the lower half of the plant. Repeat this every few weeks as the plant grows taller. This forces the plant to grow more potatoes along the buried stem and keeps the developing tubers in the dark (sunlight turns potatoes green and toxic).
The Harvest
Once the plants flower, you can carefully reach into the soil and sneak a few small "new potatoes" to eat right away. For a full storage harvest, wait until the green tops completely die back and turn brown in late summer. Leave the potatoes in the ground for two more weeks to cure and toughen their skins, then gently dig them up with a garden fork.

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