Could be for people who keey cats in flats or houses without gardens? Or
maybe it is just that some wholesale nursery has a very good sales
department!

I grow grass for my cats. I keep my cats restricted to inside the house and
in the cat 'pen' ... a 2m tall enclosure which runs down the side of my
house, filled with loads of tunnels, ramps, ledges, trees, hiding places,
hammocks (!), logs, etc.

If they went out, they would be killed on the road.

- h