<p>Growth performance over time of the four species investigated under different soil moisture conditions. (a–d): effects on the number of sprouts (means±SE) after 18, 29, 40, 62 and 84 days; (e–h): effects on the longest sprout (means±SE) after 29, 40, 62 and 84 days. Different letters indicate differences (p<0.05) after Tukey’s all-pairwise comparisons.</p