…is that the seeds can have two types of morphophysiological dormancy (after Baskin & Baskin):
- In the first case the roots will emerge in late fall after a warm stratification and the shoots growth will begin in the following spring (= after cold stratification); deep simple epicotyl dormancy.
- In the second case (said to occur in about 49% of seeds according to a study), the shoots growth will begin in the second spring after sowing; deep simple double dormancy.
The lots of seeds shown were collected from different sites, and I wonder if this was also a decisive/only factor in displaying the different types of dormancy. It is well known that the germination dormancy traits have a genetic component.
Temperatures in the summer/winter may also have role; to be sure I will try to repeat the sowing with seeds of both populations/at the same time. It would be nice to know and collect seeds from certain populations knowing they will germinate in the first year after sowing.
Note: To be clear, for Sanguinaria we are only talking about fresh/or moist kept seeds.