We bought a tub of wheat grass when they were kittens, but never sprouted it. DH is unsure how you get it through a little cat brain that "this" plant is okay to eat, but "that" plant is not. I agree. I'm not sure how they can make the distinction with confusing the heck out of them.
We've given them these wheat grass treats, but are currently out of them. I can't say they did or did not go for the plants (ferns being the current fave, along with the Kalenchoe) when they were eating it. Maybe I'll pick up some parsley at the store this afternoon and see how that goes.
Thanks!