Cauliflower is a member of the cruciferous vegetable family, which also includes broccoli, Brussels sprouts, and kale. These vegetables are known for their cancer-preventing properties, but can chickens eat cauliflower? The answer is yes, but there are a few things to keep in mind. Chickens can eat both the florets and the leaves of the cauliflower, but it is best to chop the florets into smaller pieces so that they can more easily digest them. too much cauliflower can cause digestive issues in chickens, so it is best to offer it to them in moderation.