Information on the growth of forest plantations is necessary for planning of ecosystem-based management of the plantations. This information is also useful in validating or refining computer simulators that estimate plantation growth into the future. Such growth information has been obtained from a 45-year-old ponderosa pine (Pinus ponderosa) plantation in the Hart Prairie area north of the Fort Valley Experimental Forest headquarters. Average annual growth in terms of number of trees, basal area, and volume was obtained. Growth information such as that obtained on this plantation is crucial to planning of longterm forest management activities.