In this loving tale about growing up, a little tree learns it's not really so frightful to let go of your leaves in autumn. A wonderful book for anyone facing change, this is a stunningly heartfelt ode to the challenges of growing up and letting go. A story as poignant for parents as for their kids, from the creator of Otis the Tractor. Grades: Pre-K - 2, Ages: 4 - 8, Reading Level: GRL: L.In this loving tale about growing up, a little tree learns it's not really so frightful to let go of your leaves in autumn. A wonderful book for anyone facing change, this is a stunningly heartfelt ode to the challenges of growing up and letting go. A story as poignant for parents as for their kids, from the creator of Otis the Tractor. Grades: Pre-K - 2, Ages: 4 - 8, Reading Level: GRL: L.