Whether you are growing your potatoes in containers, pots or bags, the advice is the same. First, you will need to put about 7 inches of the best quality compost manure in your containers. Multipurpose compost is a great alternative that can be used as well. For best results, it is essential that you consider mix your compost with well rotted homemade compost/ farmyard manure and/ or sharp sand. The mixture should be 50/50. The benefit of ensuring your mix contains organic material is that it becomes much easier to water your potatoes throughout the whole season. The good thing with the organic material is that they contain highly valuable plant food that can boost the growth of your crop. Chicken manure pellets also works great too.