Individual narrow‐sense heritability () and type‐B genetic correlation () estimates (standard errors in parentheses) using the single‐trait ABLUP and GBLUP methods for the across‐site analysesa. For heritability estimates, the significance of the additive variance component is shown (see Table S4). For type‐B genetic correlations, the significance of the site × additive variance component is shownb. A significant site × additive variance indicates significant genotype‐by‐environment interaction (i.e., smaller values of )