Trees are an important part of our environment in Iowa communities in the urban forest and in our 2.5 million acres of natural woodlands. Tree size ranges from a few feet in height and width to more than 100 feet tall and wide for the largest tree in Iowa. Tree tops are visible and appreciated; tree roots are not visible, usually misunderstood and certainly not appreciated very much. The root system of woody plants is essential for their survival and growth. Often, the general decline of woody plants is directly related to the health and vigor of their root systems.