Mon dieu! Regarde this pumpkin enorme! Je suis en vacances in France at the moment and I found this is in the local newspaper. Fabrice Boudyo already holds the record for the biggest (heaviest) pumpkin in France with his 2007 effort weighing in at 553kg. However, this monster looks set to smash that as it weighs a whopping 643kg. In the article, he reveals the secret to his success: nettle mush, horse manure, dried blood and “oxygenated” compost mixed with molasses and alfalfa.