Stand uniformity is a desired trait affecting stand development and productivity. Stand uniformity is expected to increase if plantation forestry moves to varietal stands and continues to increase management intensity. In this study, we evaluated the response of stand uniformity of 4-year-old loblolly pine clonal varieties and families to changes in silvicultural intensity on the Virginia Piedmont (VA) and on the North Carolina Coastal Plain (NC). Stand uniformity was evaluated through the coefficient of variation for dbh, tree height, and tree volume. The stand productivity ranged from 9.3 to 44.1 m(3)/ha at NC and 13.6 to 57.0 m(3)/ha at VA. An increase in stand uniformity was positively related to an increase in stand productivity (r = -0.52 to -0.64). Our results suggest that stand uniformity is not an attribute of all varietal stands, with certain varieties being more uniform than others. At this young age, stand uniformity was better explained by microsite heterogeneity, followed by the genotype effects, with no effect attributed to the silvicultural intensity. Our results reinforce the need of matching varietal forestry with precision silviculture to achieve gains in productivity.