Fig. 2

Comparison of the groups‚ “standard seed stand”, “plus tree mother with straight grain,” and “plus tree mother with wavy grain” of the A. pseudoplatanus progeny trials Romrod and Schotten. a DBH. b Tree height. Boxplot with additional information on single tree data (black dots); n = 125, 92, 107 (left to right). Different letters indicate significant differences in pairwise comparison of the groups (Tukey’s test, p < 0.05)