If stored correctly, cannabis seeds have an excellent shelf life and could in theory be stored for at least 10 years. However, the success rate of the seeds germination does drop significantly after two years of storage. When you decide to germinate old seeds, make sure to take them out of the refrigerator at least 12 hours and then soak these older seeds for 12 hours in 22C° water with a couple of drops of hydrogen peroxide to soften the shell.This way the seeds can acclimate, which will increase the chance of germination.
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