In case you're wondering, this grass is fine for humans too and great in juices!
This is not a pre-grown product, it comes with instructions to grow your own in just 7 days. Find fully-grown cat grass at the St. Johns Farmer Market every Saturday (while supplies last).

Here's some info on Cat Grass from hillspet.com

"Cat parents, did you know that your little meat-eater may like some vegetation in her diet? That's right, she may enjoy having cat grass. Despite being obligate carnivores (that is, they have to eat meat in order to get their necessary nutrients), cats like to munch on plants for a variety of reasons."

Keep reading here:
https://www.hillspet.com/cat-care/nutrition-feeding/cat-grass-safety-and-information

This product is an Oat grass variegty.