Haha, my cats chew everything!
however, you can buy plants for cats and dogs to chew and eat, and theyre perfectly safe and edible for them.
You can grow patio, hardy or lawn grass an they're fine to grow and leave around indoors for them to eat.
also catnip, and even lavander!
my grandmother uses lavander for the stray cats around her garden, she has 3 of them outside and 2 inside.