Plant mapping has become an important tool for cotton management. This practice involves regular sampling of cotton plants for key agronomic data such as number of retained fruiting structures at the top and bottom of the plant, height-to-node ratio, and position of the white flower. When applied during the growing season, plant mapping may be used for determining application rates of plant growth regulators, for treatment decisions on certain insect pests, and so forth. When applied at the end of the season, it may be used for a post hoc analysis of crop productivity and the factors affecting yield. University of California personnel are engaged in an effort to develop software for use in plant map data collection, analysis, and interpretation. Previous efforts have focused on programs that can be carried into the field on palmtop computers. The present paper describes a desktop computer-based program called CottonPro for archival storage and graphical analysis of plant map data.