Colin and Donna Craig-Brown were working in their New Zealand garden in late August.They were removing unwanted plants when they found something strange.After a little digging, Colin discovered there was a very large potato growing in his garden.And they did not even plant potatoes!How large was the potato?"We couldn't believe it," Donna said. "It was just huge."The couple worked the potato out of the soil and brought it to a scale.It weighed almost 8 kilograms.That's about the same as a small dog.The potato may be the largest ever recorded.Guinness keeps a list of world records.In 2011, a large potato from Great Britain weighed just under 5 kilograms.The New Zealand potato, now named Doug, could break the record.The Craig-Browns asked Guinness to recognize their potato as the largest ever.They are waiting to hear back from the organization.The potato has become famous in the town of Hamilton.