Rabbits are vegetable lovers, they should be fresh and crisp. Look for a selection of different varieties of dark, green leafy veggies and root veggies such as carrots, and green leaf lettuce. Stay away from beans and rhubarb. Select at least three kinds of vegetables daily. A variety is necessary in order to obtain the necessary nutrients, with one each day that contains Vitamin A. Add one vegetable to diet at a time. Eliminate if it causes soft stools or diarrhea. Here are some veggie rabbits love: Alfalfa spouts, Basil, Brussels sprouts, Carrots, Celery, Mint, Parsley, Peppermint leaves, Broccoli, Beet tops, Endive, Romaine leaves, Dandelion green etc. For me, I like to eat Morning glory, Basil, Chinese Kale, Choi Sum, Baby corn and Carrot. My caretaker buy only organic vegetables because they are safe from presticides.
Be careful not to give your rabbit too many vegetables, as they are high in water content and can cause diarrhea or loose stools. If this happens, reduce or eliminate veggie from the diet.
Moreover, don't give your rabbit so many veggies that he starts to eat them only and neglect his pallets. Veggies should be a supplement, not a main dietary staple.