Ya know, there was an old story arc in Swamp Thing (dont remember who was writing at the time, might have been GM..) where Swamp Thing attacked Gotham City. Batman unknowingly assisted some villains into 'killing' Swamp Thing. However, being an elemental, his consciousness escaped into the cosmos, and he visited all these strange planets with all this bizarre flora....strange landscapes....strange mushrooms.... in retrospect, I wonder what inspired this storyline. There were several issues, as I recall, that included no dialogue at all. But it seeded my imagination about plant consciousness not only on earth, but 'elsewhere.'