Here is some information from our vet about what foods are safe and not safe for rabbits.
NEVER FEED your rabbit:
Iceberg Lettuce, cabbage,raw beans, potato or potato peels, or anything to old to eat yourself, Spinach,cauliflower,mustard greens, rape,kale,rhubarb,apple seeds,peach pits, apricot pits,or nectarine pits as these items are either poisonours or toxic over time.
SAFE for your rabbits
Carrots and tops, Romaine(leaf lettuce) Apples, Parsley, Celery and/or leaves, Grapes, Watercress, Brussel sprouts, Kiwi, Cilantro, Broccoli,Banana, Mint, Tomato, Pear, Radish Leaves, Collard Greens, Peaches, Beet greens, Pineapple, Strawberries, Pea Pods, Papaya, Blueberries.
DO NOT give your rabbit HONEY COATED seed treats found in grocery or pet stores. SEEDS can KILL your rabbit.
I hope that this helps.