Potatoes are grown from seed tubers that are certified free from virus and disease and are known as ‘seed potatoes’. It is important to always buy in fresh ‘seed’ each year. Do not be tempted to plant sprouted tubers from the kitchen as these are not certified and may introduce potato virus and disease to your garden. Tubers are available in late winter/early spring and need to be stored in a cool dark place prior to chitting and planting out in March or April. https://www.gardenorganic.org.uk/factsheets/growing-potatoes