Fig. 4

The interaction plots for the mean number of heads per plant, estimated on a log scale, for the autumn and spring parental populations of A. myosuroides (a) and L. multiflorum (b) across vernalisation treatments. The treatments are NV (no vernalisation), GV (germination vernalisation), SV (seedling vernalisation), and GSV (germination and seedling vernalisation). The dots represent the population-level means for the estimated number of heads per plant, and error bars represent 95% confidence intervals of the mean.