Children don't have to be botanists-in-training to discover the message of this book: "All plants are interesting -even the weeds." Young readers are sure to be intrigued by the wide variety of shapes, sizes, and functions in flowers, fruit trees, and all sorts of other flora. How Does a Plant Grow? will inspire children to be newly alert to the many wonders of the plant world, from how seeds sprout to why leaves turn to the light to the vital roles of stems and roots. Interest Level: K-3 Reading Level: 2.6 Lexile Measure: 420 Iowa Core Science.