Avoiding just five storage conditions will make a huge difference in the shelf life of your herbs. These factors are light, heat, moisture, odor and air.
Keep your herbs in the original packaging, in a cool and dark pantry to avoid light.
Avoid placing it in the sun or near heat sources, like a stove or oven.
Dried plants are shelf stable but absorb water from the air very easily. Until they are ready to brew, keep it away from boiling water and other humid areas, like above a dishwasher vent or in a refrigerator.
Common odors are something that herbs can absorb very easily. By leaving the herbs in their original packaging or placing them in an air-tight container of your choosing, you will reduce the chance of changing the natural flavor of the herbs.
The more exposure to air increases the chances that your herbs will absorb moisture and odors. Avoid leaving your herbs out by sealing them in the original packaging or an air-tight container of your choosing.