Environmental signals which include temperature fluctuations, mild exposure, and humidity concentrations can trigger the discharge from dormancy. Some seeds have to have cold stratification, where minimal temperatures change hormonal amounts and weaken seed coats. Trilliums are a good illustration. Dry saved seed lasts about 6 months, while moist packed seed https://www.odeh.ps/wall/blogs/4770/Grow-Your-Own-Plant-Kit-A-Comprehensive-Guide