Is Elephant Grass meant to be lacking the living trait?
I understand with a very high life total that regenerate x might have been seen as a wrong choice, however as it is a plant should it not have the living trait and not nonliving as it currently has by default conjuration rules?
It's not strictly
a plant which would have all the usual Plant traits, but a terrain representing thousands of grasses, and the massed effect of them.
If it was living, that doesn't imply Regenerate (and other plants don't have regenerate too). This way it's immune to Psychic damage!
I can't actually answer your question, but it seems to be justifiable either way. Swamp isn't living either.