Global population is projected to increase by 3.1 billion people between 2000 and 2050. Global affluence will also increase during this period, causing demand for food and feed protein to more than double. Conventional protein sources will not be able to meet this additional demand without exacerbating already serious environmental problems. Alternative protein sources urgently needed to meet growing demand. One alternative is protein recovered from the leaf cells of leafy plants. Historically, leaf protein was recovered from alfalfa using an inefficient and uneconomic recovery process. It may be economically feasible to use an improved process to recover protein from waste green plant materials, such as garden waste and paunch grass. This research seeks to determine the protein content of these materials, which indicates their potential to be processed into animal feed.