Instruct: Classify Amazon reviews into positive or negative sentiment
Query: good concept, falls short

I purchased the aqua garden along with the platinum fountain and 2 refills for the garden. I am regretting my purchase of the aqua garden and refills. I have one cat that eats the grass, and it is not the lush little pod of kitty grass that grows, but a sparse few thin blades of inferior grass. It took a few days to start growing (no big deal), but then it really did not grow well after that. My cat does gnaw on it, but either he is eating faster than it grows, or it just is not growing well. I feel that the kind in dirt that you can buy at the pet store is a better fit (at least for my kitty). I am going to try starting it in a different container and then putting it into the fountain, so I will update if there is any improvement with that method.