One place with plants that have different yinyang natures

I was asked a question after posting the ” Nature of herbs and pertaining meridians”: why is it that at one place with the same yinyang condition exists plants that have different yinyang natures.
Well, although at the same place, but things are created in different times, so they have different yinyang natures. That is what The Book Of Changes is about.
At one place, in different time, a different phenomenon is presenting; on the other hand, in different places, at the same time, there would be different phenomenon appear.