Results/Conclusions: Overall, triploids tended to grow faster than diploids. For example, by the end of the field-based study, triploid genotypes were 50% larger than diploids genotypes when controlled for initial plant volume. However, in the greenhouse study ploidy was insignificant to mass acquisition, and in the cold frame study ploidy was only marginally significant. In some studies, triploids had higher photosynthetic rates than diploids and allocated more biomass to leaves than diploids. These patterns were not consistent among all studies and measurement windows. Although triploids grew faster than diploids, ploidy had less impact on plant final size than did population of origin. Compared to those from the Great Lakes, genotypes from the Intermountain West grew more slowly, had lower leaf mass ratios, thicker leaves, lower foliar nitrogen and condensed tannin concentrations, and higher phenolic glycoside concentrations in one or more studies (p<0.05 for all effects). Overall, these studies indicate that a triploid growth advantage may be explained by physiological factors such as allocation to leaves or gas exchange rates, but influences of ploidy level on tree growth were less pronounced than those associated with population of origin.