I have good results by sprinkling human hair and some urine (which I collect in a bottle during the week prior to visiting my grow spot :yeahthat: ) about a metre around my plants. I've seen many rabbits in the area, so it's been a specific concern of mine. Also, the home-made organic insect repellent that I use - which contains chillies, garlic and washing up liquid may have the added effect of making the leaves taste like s#!t - which may further deter them. I take my dog on my weekly visit too, so she will be spreading her scent around the general area. Combined, I hope that these methods produce a strong deterrent.
I think I've read that once your plants are a reasonable size they become less attractive to the bunnies, so if yours are less than 2ft at the moment, fencing may be the best option. Good luck.