The book opens with the words: "A little boy planted a carrot seed. His mother said, 'I'm afraid it won't come up." Despite the skepticism of his parents and, particularly, his older brother, he persists and "pulled up the weeds around it every day and sprinkled the ground with water." The book concludes simply "And then, one day, a carrot came up just as the little boy had known it would." The carrot is so large that it fills a wheelbarrow.