To plant potatoes in containers, acquire potting soil, seed potatoes, fertilizer and containers; prepare the potatoes for growing; cover them with soil; and hill them while they grow. Finally, harvest the potatoes.
Potatoes can grow in any large container, but make sure it has good drainage. Choose high-quality potting soil. An organic, slow-release fertilizer is recommended, and it can be mixed into the potting soil. Make sure the potatoes receive six to eight hours of sun per day.
Fill the container with 4 to 6 inches of potting soil. If fertilizer is not already added into the soil, mix it in while following the instructions on the box. If the seed potatoes are small, plant them whole if desired. The plants should have some breathing room, since they typically grow very large. Four small potato plants in a 20-inch-wide container is ideal.
Cover the potatoes in 2 inches of soil, and water them well. The soil should always be moist, but not wet. Once the plants grow 6 inches, hill them by adding a couple of inches of a soil-and-compost mix. Don't break the plants, and allow 2/3 of the plant to stick out. Repeat this process a few times if necessary.
Finally, harvest the potatoes any time after the plants have flowered. Reach down into the soil, and simply pull out the potatoes.