Liam, a curious little boy who likes to be outside, lives in a city “without gardens or trees or greenery of any kind.” One day, while exploring an abandoned elevated railbed, he discovers a small patch of weeds and wildflowers. After a little bit of trial and error, Liam nurses his newfound plot into a “restless” garden that explores the length of the railway and, after a dormant winter, begins to find its way into the city below. Brown’s flat, faintly retro graphics make a vigorous accompaniment to his fey text, which personifies the “curious garden” with appealing earnestness. In an author’s note he describes the greening of Manhattan’s abandoned Highline, which inspired this hopeful little paean to the persistence of growing things in the dreariest places. (Picture book. 3-7)