I used to get those little tubs of cat grass to grow for mine and one thought Id ask at the local garden centre if you could buy the seeds as I would then put them in a big tub to grow them. Sadly to poor girl got very confused and ended up trying to sell me turf squares so I could grass over my balcony
Now I dont have any out door access at all and as the cats never ate the grass anyway I have to rely on indoor cat and hairball biscuits
love
Tab
Tab, you can buy the seeds in somewhere like Homebase (or of course get them from CP as Ela said) - they are with the seeds for veg, etc all on little hooks - thats where I got ours - 60p for LOADS! we still have loads in a drawer
Ours are indoor too but they ate it out of a little planter - we used to leave it on the window sill (one of the ones they didnt go on) until it got long enough for them to eat - doesnt take long!
defurrum works well too though, ours love those!