Domestic rabbits eat the same thing no matter the season because their diets are controlled, but wild rabbits may have to adjust a bit from the preferred grass and leafy weeds to bark, twigs and even conifer needles. Rabbits are herbivores, meaning they eat mostly plants, including some vegetables.
Domestic rabbits are normally fed a diet of pellets designed especially to meet the rabbit's nutritional needs. A constant supply of Timothy hay is needed to aid digestion, as well as a varied diet of appropriate fruits and vegetables. While domestic rabbits can and do enjoy clover, grass and other leafy plants that can be found in most people's yards, the greens must not be treated with any weed killers or pesticides in order to avoid poisoning the rabbits.