Calla not only saves the last wildflower in the big city, but she soon learns that she has saved much more. This generation of children may be the last to see monarch butterflies due to deforestation, population growth, construction and the loss of wildflower meadows where milkweed naturally occurs in the U.S. It is our hope that this book will ignite a spark in present and future generations to help save North America's most recognized butterfly.