Yes, Cabbage is a very safe cruciferous (related to the cabbage family) vegetable that your rabbit can eat daily. There's a variety of cabbages that your rabbit can eat: White, red (Often seen as purple), green, and a favorite of ours, Chinese (Bok Choy). Cabbage has excellent nutritional value due to its being rich in Vitamin C. It's worth noting that your rabbit may disagree with Cabbage. To avoid GI Stasis and excessive gas, give your rabbit minimal quantities when introducing it into their diet.