wheat grass and its good for you. If you do it organ you might be able to sell it to a local Health Food Store that Juices. They swap out there trays with what they have cut and pressed. And being local you will have sa small carbon footprint.
I have found that if you cover then with a clear Dixie cup till they root it help. You can also starting the clones in the seed starting material that the Aerogarden seeds or Their own seed starting kit. It works well.