SQUASHED, by Joan Bauer (Putnam 2001). Ellie Morgan has a dream: to grow the biggest pumpkin in Iowa and beat that black-hearted Cyril Pool once and for all. But an unsympathetic dad, pumpkin thieves, and bad weather get in the way. Can Ellie win the competition (and the boy) and stay true to herself (whoever that might be)?
An oldie but a goodie: Joan Bauer's first novel (and winner of the Delacorte Prize in 1992), SQUASHED, is a funny, heartwarming story about family, love, friendship, finding out who you are, and giant vegetables. Highly recommended.