Fall is here, and a layer of colorful leaves will soon blanket lawns across the state of Maine. Tidying up the leaves on your lawn before winter will make spring clean-up much easier for homeowners. Some wildlife specialists, however, think you should leave the leaves over the winter to promote the health of your local ecosystem. “Our typical lawns have little to no ecological value, and instead often serve as potential hosts for exotic or invasive species of plants and insects,” said Eric Topper, education director at Maine Audubon.