Posted: 07/06/2014 at 12:49
Buddyboy, you are being too simplistic. Seed potatoes are not just small tubers from last year's crop.
Seed potatoes are grown by specialists. I can't remember the rules. I did know once, many year's ago. If you look into the subject, or you may already know, seed potatoes traditionally came from Scotland and Northern Ireland. They are not just any old saved tuber.