Grow is the story of Dinah Little, a no nonsense, curmudgeonly farmer with a heart of gold, and Charlie, the unknown and unloved niece Dinah begrudgingly takes in after discovering her in an orphanage.

Dinah's farm is in the self-proclaimed "Pumpkin Capital of the World" where the biggest event of the year is a high-stakes cutthroat giant-pumpkin-growing contest where the entire town gets their pumpkin patches ready to compete for a cash prize and pumpkin glory. Charlie has a special bond with plants and, combined with her feisty personality and determination, decides to grow a gigantic pumpkin for the competition, to attempt to win the coveted prize.

However, Charlie and other pumpkin growers face sabotage and advanced pumpkin technology in the battle of the pumpkin bulge. As she nurtures 'Peter', her pumpkin, and sees him grow, so does a bond between Dinah and Charlie.