11 May 2016 Last updated at 08:17 BST
Matthew Oliver paid more than one thousand pounds for the seed which came from the current world record holder grown in Switzerland.
The winning pumpkin weighs 165 stone, so Matthew's would need to weigh-in at more than a tonne to beat that.
It may be five months until Halloween, but for one gardener it'll be a nail biting wait to see if his seed grows into the biggest pumpkin in the world.