If there is life in the plant kingdom, there must be consciousness also. What, then, is this consciousness? It is like that of a deep sleep. Nay, we may even go back further and assert of the mineral kingdom that there is life in it, too. For the cells of plants are built up out of the molecules. It is impossible for the human mind to conceive of what the mineral consciousness is like, but the closest description would be that of the deepest trance.
-- Notebooks Category 26: World-Idea > Chapter 1: Divine Order of The Universe > # 205