Posted: 17/07/2013 at 13:04
No, if you re-plant them they will stay dormant until next year. However, you can buy seed potatoes which have been kept in cold storage and plant those now. They are usually advertised as "Christmas potatoes". These are usually grown in bags so they can be moved into a greenhouse though - it may be hit and miss if you plant them in the ground, but if there aren't any early frosts you could be OK.