Grow potatoes in bags
If you don't have a space in your garden for a vegetable patch, you can grow potatoes in bags or containers on your patio.
Make sure your container has adequate drainage holes, then put 8 inches of compost in the base. Place one or two seed potatoes per pot or sack on top of the compost. Cover them with about 4 inches of compost and water in well.
Keep Earthing Up
As the potatoes grow, unroll your sack to make the sides higher. Keep covering the new growth with compost; don't worry, the shoots will soon find their way through the soil. When you reach the top, and can hill up no more, just let the plants grow. Water regularly. New potatoes can be harvested any time after flowering.
Source : hgtv.com