I have a rabbit that likes my Spirea shrub and now it is dead!

How about soap shavings? It should stop them from nibbling

Garlic and Chili Powder can be effective.

"½ cup of garlic powder and ½ cup of Cheyenne [sic] pepper can be mixed together with 2 cups of water to create a rabbit deterrent. After mixing thoroughly, the repellant should be allowed to sit outside for at least 2 days before using. After it has had time to sit, you can add just a few drops of dish soap and swirl it in as well. This mixture should be sprayed on your garden and plants that the rabbits might find delicious. Adding a bit of chili powder at the base of all of your plants will make the deterrent settle into the soil and make it much more effective. Sure, rabbits don’t like the smell or taste of this mixture, but you have to keep applying it every few weeks."

http://www.wildlifeanimalcontrol.com/rabbitrepellent.html

ive heard human hair deters rabbits and deer havent tried it

spray it with cheyenne pepper mixed with water

I just sprinkle the Cheyenne pepper on my plants. It seems to help a lot.