A quick look at the list; don't seem to be herbs on it AFAIK. I checked for lavender, oregano, thyme, basil, rosemary etc which I grow in a pot.
If most if not all herbs are ok, kitties are probably ok with lemongrass. It tastes very strong so it's not likely they'd snack it anyhow.
Cook it up with some chicken mind you and they'd be in head first :-)