A new record for the Southern Hemisphere's largest pumpkin has been set by a Waikato farmer.

Tim Harris and his record breaking pumpkin

Tim Harris entered a 754 kilogram specimen into the Great Pumpkin Carnival in Hamilton over the weekend.

The Morrinsville dairy farmer said the pumpkin took three months to grow, but it's "definitely not the prettiest pumpkin I've grown" and it's "not that nice tasting", he told Radio New Zealand.

Mr Harris' record-breaking pumpkin comes just a week after Aaron Akkerman from Marton broke the New Zealand giant pumpkin record.