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/