Figure 3: Cumulative germination rates of G. littoralis seeds sown some months before spring germination.
From: Natural persistence of the coastal plant Glehnia littoralis along temperate sandy coasts

0.5 month before: 0.5 month before the germination start; 1.5 month before: 1.5 month before the germination start; 2.5 month before: 2.5 month before the germination start; 3.5 month before: 3.5 month before the germination start; 4.5 month before: 4.5 month before the germination start.