Any ideas what story this might be? My Grammie told me about it and I'm trying to find it. TIA
Since the OP seems to have already accepted this, I'm going to post it as an answer so it's officially recorded.
The work seems to be Stranger In a Strange Land by Robert Heinlein, specifically this passage where Valentine Michael Smith first encounters a lawn:
Smith wiggled his toes in the cool grass, then said timidly, "But these live?"
"Sure, they're alive. It's real live grass. Ben paid a lot to have it that way. Why, the special lighting circuits alone cost more than I make in a month. So walk around and let your feet enjoy it."
Smith missed much of the speech but he did understand that the grass was made up of living beings and that he was being invited to walk on them. "Walk on living things?" he asked with incredulous horror.
"Huh? Why not? It doesn't hurt this grass; it was specially developed for house rugs."
Smith was forced to remind himself that a water brother could not lead him into wrongful action. Apprehensively he let himself be encouraged to walk around-and found that he did enjoy it and that the living creatures did not protest. He set his sensitivity for such things as high as possible; his brother was right, this was their proper being-to be walked on. He resolved to enfold it and praise it
So he is dumbfounded by the grass, accepts it, and comes to "praise it" which suggests an almost religious response at least on his part.