Seasoning your large humidor is the first step in protecting your cigars and the humidor itself. Spanish cedar wood is the most common type used in humidors as a liner, though it is not truly a cedar but a hardwood. Using actual cedar in a humidor can be poisonous. Spanish cedar is the best lining for most humidor seasoning needs.
Since wood absorbs moisture, preparing the humidor before you place your cigars within is essential.
If your large humidor does not come with one purchase and use a hygrometer with it.
Fill a small bowl or dish with distilled water.
Place the distilled water and dish within your new humidor before placing any cigars.
Next, set your hygrometer on the bowl and close the humidor lid.
Allow the humidor to sit unopened and undisturbed for 24 to 48 hours to stabilize levels before adding cigars.
Keep in mind that different types and brands of cigars may need different humidity levels, so always check the brand's instructions.