Yes you can blend grass with a high power blender.Then use a nutmilk bag to extract the juice.I wouldnt use an average blender,or a blender thats lacking a plunger for pushing the grass into the blades.There is a demo at youtube.com by blindguru where he blends wheatgrass in a highpower blender.Blindguru is a bit well dramatic and somewhat funny but worth a look just the same.