Rabbit attack?

Hello, everyone. It's been a little busy around the place and I forgot to post.

I went out to check on plants yesterday and was shocked to see this:

My alpine iris plant has been eaten down to a nubbin! And several rain lily plants are either gone altogether or chomped to a little thing like this! 

DH says he saw a rabbit in the yard a couple of days ago, which darted out under the fence. (Smart rabbit.) Maybe this explains a number of disappearances lately.

What can be used to repel rabbits? Especially since a lot of the grass they used to have for munching on has gone dormant or died because there's been no rain.