Harvey Potter owns a genuine US Government Inspected balloon farm where he grows balloons to order: clowns, animals, monsters for Halloween, and even—when the young narrator who has been delightedly watching the crops gets old enough to strike out on her own—a huge floater to carry her off. What's his secret? Since he farms at night, no one knows. Nolen's writing has an oral lilt to it; Buehner (Adventures of Taxi Dog, etc.) depicts Potter's unique crop in jellybean colors, bobbing atop cornstalks in businesslike rows. A wonderfully appealing premise, skillfully developed. (Picture book. 6-8)