Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Growing the cat grass is an excellent idea, Elaine.
And, if your cat tends to dig in the dirt of a large pot, cut a piece of "plastic canvas" (from a craft store) to fit in the top of the pot, with an opening for the plant... easy to water and the cats can't get to the dirt.
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion