Several chemical repellents discourage rabbit browsing. Always follow exactly the directions for application on the container. Remember that some repellents are poisonous and require safe storage and use. For best results, use repellents and other damage control methods at the first sign of damage.
Many repellents are not designed to be used on plants or plant parts destined for human consumption. Most rabbit repellents are contact or taste repellents that render the treated plant parts distasteful. Taste repellents protect only the parts of the plant they contact; new growth that emerges after application is not protected. Heavy rains may necessitate reapplication of some repellents.
Dried blood meal sometimes keeps rabbits from damaging small flower beds or garden plots. Place these substances among the plants. Blood meal does not weather well, however.
Taste repellents are usually more effective than odor repellents. The degree of efficacy, however, is highly variable, depending on the behavior and number of rabbits and the alternative foods available. When rabbits are abundant and hungry, use other control techniques along with chemical repellents.
Some repellents are more effective than others. BGR (Big Game Repellent), also known as Deer-Away, is one that works for true herbivores like rabbits, but it will need constant replenishment. Exclusion is certainly a more permanent solution.
Contact your local Cooperative Extension office for details specific to your area.
Resources: (online)
Cottontails
