Yes.. Even [plants have been argued to have Buddha nature][1]... after all Buddha nature is all-encompassing, the root of existence and non-existence.. My perspective: **Nothing has Buddha-nature! Nothing but "Buddha-nature" exists.** Buddha nature *is* the Universe. The world, items and conscious beings are just constantly changing interdependent items bobbing around within it... Bodhisattvas thus identify themselves as the whole universe and not just as a person. [1]: http://theendlessfurther.com/even-plants-and-trees-have-buddha-nature/