Green grate piece doesn't clip on and gets pushed off by growing grass.

Pros: + Stable, cats can't knock it over. + Rubber grips keep it from sliding around the floor + Good size, allows for a decent clump of grass Cons: - Green cover does not clip on and gets pushed up as the grass grows. If you plant a lot of seeds, like I did, it's impossible to keep down or to push the grass through the grate once it is off. - Would be better if it came with grass/soil but it's easy to find something here on Amazon.

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