As I've mentioned, I'm one of those people that doesn't use a hoe. Instead I pull the weeds, one at a time, or a handful at a time. If there's a cat in the garden with me, it follows me around, meowing worriedly and pushing my hand while I'm pulling the weeds. This evening I had a flash of insight:
They only eat one type of grass. Well, that, and catnip. I think they think they're protecting me from eating the wrong thing.