Morgan loves the cat grass. I've grown some for him and bought it at Petsmart too. After 11 years, I finally read that little card that comes in the grass. It says to only give it to them for brief periods of time and then when they aren't eating it put it in the fridge!! It helped to prolong the life of the grass by quite a while. I haven't been near a pet store in months, so Morgan hasn't had any in a long time. I wish I had learned about keeping it cold a long time ago.