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Varsha, To know the answer it is very important that you fully understand the concept of depth of field and also lens MTF charactersistics. I have a separate chapter for Dof and in “camera lens buying guide” I talk about MTF of a lens. Please go through them.
And in short, using an aperture value depends on the focal length of the lens being used, as more than the aperture, it’s the focal length and the camera-subject distance which matter in landscape photography. So using f8 or f11 or f22 depends on the above 2 parameters.
Rgds,
Sudhir