This project is designed to i) improve rec- ommendations for sand particle size distribution and the depth of the root zone by consideration of the microenvironment; ii) evaluate composts as organic additives and inorganic products for root zone mixes compared to peat sources; iii) assess the potential of various root zone mixes to reduce management and resource inputs; and iv) monitor the physical, chemical, and biologi- cal changes that occur in root zones as greens mature for understanding factors that contrib- ute to the success or failure of greens.