A fixed-plot monitoring system was implemented in 1992 to evaluate vegetative communities in two large wooded areas at Valley Forge National Historical Park. The objectives of this monitoring system are to: 1) describe the existing understory plant community on Mount Misery and Mount Joy in terms of species richness and abundance; and 2) determine changes in abundance and species composition of understory plant communities in fenced and unfenced plots over time. This report summarizes the data collected in these plots in 1993, 1995-1996, 1998, and 2003, and presents the results of statistical analyses of the data to determine if specific vegetative changes have occurred over time.