Fig. 1From: Spring and autumn phenology of hybrid aspen (Populus tremula L. × P. tremuloides Michx.) genotypes of different geographic origin in hemiboreal Estonia§ The linear relationship between the start of the bud-burst and the number of days until leaves attained full size (p < 0.01**, p < 0.001***) in year 3 and in year 6Back to article page