Hilling potatoes involves covering the plant with loose organic material periodically to encourage the tubers to grow deep and wide, improving the flavor of the potatoes. Peter talks about how to hill potatoes when you're growing them in a garden bed. Unlike in many other places, in a bed there isn't a lot of room and dirt around the plant to hill with. So instead, you can scoop up the soil you can around the plant and then add a mixture of germination mix and compost for additional material.