Seed Storage: Effects of temperature and moisture
Each 1% reduction in seed moisture doubles seed life.
Each 10o F reduction in seed temperature doubles seed life.
Above 30% seed moisture, non-dormant seeds will begin to germinate.
10-15% moisture content suppresses seed activity and fungus.
At less than 14% seed moisture, no ice crystals will form, so you may store seeds below freezing.
At below 10% moisture, few insects survive.
At below 50o F, few insects grow.
100o F is the maximum temperature that should be used to dry seeds of most plants.
4-6o F is ideal seed moisture content for long term storage (more than a year). Can be higher if refrigerated.
Seeds stored in refrigerator or freezer must be in sealed container, or they will imbibe moisture.
Seeds dried to a low water content take a longer time to germinate.