Fig. 3From: Spring and autumn phenology of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) genotypes of different geographic origin in hemiboreal Estonia§ Comparison of mean current annual height increment (CAIH) and standard errors between the third and sixth growing seasons (p < 0.001***; ns not significant) for different P. tremula parent origins. Letters denote significant differences in the given year according to the Tukey LSD testBack to article page