have just bought some 'catriona' early spuds and have never grown them before. Are pots a good idea? how many to a pot? does each potato grow a plant or what? how does it work? I have a reasonable amount of land but don't want them to take over. Should i plant a few now and then more later etc...to avoid the 'lettuce glut' i got from sowing a whole packet a few years ago?