That’s a tricky question, which has two answers, yes and no. It’s hard to judge the amount of cinnamon that you’ll need to be an effective deterrent against rabbits. Too little might not do anything at all and too much could be dangerous to them. So if you are insistent on pursuing the cinnamon path, the best course of action to take is to use a natural repellent that’s been formulated with cinnamon and designed to keep all manner of pests and critters away from your garden, flowers, vegetables, and anything else that you’ve planted that a rabbit might consider to be lunch or dinner.