1) Grassier 1) Inexperienced workman 2) Less experienced 3) Less ready to pick 4) Less ripe 5) Less trained 6) Less wasteful 7) Like grass on the other side 8) Like more desirable pastures 9) Like some pastures 10) Like the grass next door 11) More desirable, pasturewise 12) More eco-friendly 13) More ecological 
Greener is British slang for a naive person.