Candace i just purchased some cat grass already grown from the garden centre, and i have to warn you not ONE of my kitty crew will even touch it, they are still eating the grass around the section, but as your kitties are indoors it may well be worth a try, it is supposed to have lots of vitamins and minerals in it, i must say i am hugely disappointed in my lot ,not even trying it, so for now it is in a planter on the verandah, i live in hope that they might actually give it a go lol.