Due to the potential problems associated with leaf/grass clipping compost mixes, a viable alternative may be a chipped woody materials/grass clipping compost. The wood chips would provide the needed air spaces to prevent anaerobic conditions in the pile or windrow, while the grass clippings would supply a nitrogen source to maintain active decomposition. The wood chips would not break down entirely, but would take on a weathered dark-brown color and result in an attractive mulch when finished.
