How should dried herbs and spices be stored?

In cool, dark, dry places. Heat, light, moisture and air are the enemies of herbs and spices. Exposing them to these elements will greatly reduce their quality, color, flavor, and essential oil content. Dampness, for instances, causes caking and loss of quality. For these reasons, store herbs and spices in a dark cupboard rather than a spice rack. Avoid storing them above your stove or adjacent to dishwashers, vents or other heat sources.
 
Keep herb and spice containers tightly closed to avoid moisture and oxidation. Herbs and spices will retain more of their essential oil content and flavor when stored in lidded glass or plastic jars.
 
Source(s):
Watkins "How To Extend The Shelf Life Of Spices And Herbs"