Natural environments on school sites provide considerable multi-disciplinary educational opportunities, many of which are "hands-on" experiences that stimulate learning. This document presents guidelines on conserving and enhancing the natural environment on school sites. It provides guidance for developing the site requirements in education specifications and designs for new building construction and major renovation and/or addition projects for existing schools. Appendices address funding sources available to Maryland educators to support school site habitat projects; and Maryland organizations that can offer assistance such as the forestry service, soil conservation district offices; and a list of data about Maryland native plants. (Contains 55 references.) (GR)