Larry tried cat grass aka wheat grass and didn't like it. My old cat when she used to be able to go outside, was always chewing on crabgrass. So I've been digging clumps of crabgrass and bringing it inside. The hairball barfing stops as long as the crabgrass survives.
But now the ground is frozen solid and covered in snow and no crabgrass is available. So hairball barfing has resumed. I think next year I need to collect crabgrass seed and be able to start it during the winter for him.
They like the Wheatgrass as long as it stays fresh... which means — with watering — it is good for about a week... but they really prefer something from the great outdoors...
=^..^=