On their neighborhood walks together, a boy learns from his older sister all about the plants they see-magnolias that smell like lemon cake, creeping weeds that used to be planted for decoration, and even how dandelion greens can be eaten with spaghetti! But what makes a plant a flower, vegetable, or weed, anyway? How can his sister tell, and how does she know so much? From Boston Globe-Horn Book Award winner Jack Wong, a story of a boy who discovers that the more he learns, the more there is to know!