When rabbit came to our home little did I know, he was going to be our little composter too. Eldest was quite adamant that this dwarf rabbit eats nothing but pellets & hay. However, the rest of the family members,(me in particular) Just could not resist treating him with a little carrot/apple strips. Soon it was odds and ends of radish peels, sweet potatoes, bean sprouts, ends of chye sim, kangkong. Any greens on the day's menu. The only problem is, all his droppings & peepee are done on the paper pellet covered potty. Making picking of 'fertilizer' messy. Rabbits like to keep their surrounding clean & dry and does their business in a designated space.
HOWEVER, today while buying hay at the pet shop, I was warned that eating too much 'fresh green' will upset the tummy!!!! It may DIE!!!! Hay should make up 90% of it's diet, and not the other way round.