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This study reports on the performance of 34 clones of crapemyrtle ( Lagerstroemia indica  L.,  L. fauriei  Koehne, and  L. indica  ×  L. fauriei  hybrids) grown in field plots at four locations representative of different environments in the southeastern United States. Traits evaluated were spring leaf-out and initiation of flowering in the second season after field planting and plant height after 3 years of growth. Cluster analysis (Ward's method) was used for grouping and comparison of means across locations for each trait. Best linear unbiased prediction was used for estimating random effects in linear and generalized linear mixed models to better determine the general performance of the clones under a variety of environmental conditions. Each clone's trait stability was quantified using the regression of an individual genotype's performance for each of the three studied traits on an environmental index based on the trait mean for all genotypes grown in an environment. Sequence of clone leaf-out and size rankings were more stable across the environments than the sequence in which the various clones initiated flowering.  L. fauriei  clones and clones originating from the initial cross between  L. indica  and  L. fauriei  were generally later to leaf out, earlier to flower, and more vigorous growers than  L. indica  or the complex  L. indica × L. fauriei  clones that were evaluated. First flowering was affected by environmental variation more with interspecific hybrids than with  L. fauriei  and  L. indica  clones. Performance, particularly with respect to plant height, of several clones did not agree with previously published classifications. Information generated by this study will allow crapemyrtle breeders, landscape professionals, and consumers to better select the most appropriate crapemyrtle clone for a particular application.

Crapemyrtle Genotype × Environment Interactions, and Trait Stability for Plant Height, Leaf-out, and Flowering