In my garden, rabbits zero in on certain plants, For me it is only a problem in the spring when the plants are small. Once they get over 18" tall or so, they are too tall for the rabbits. -In the spring I sprinkle dried blood a/k/a blood meal around the plants the rabbits go after. I reapply it every other week or after any sizable rain. Once everything grows up a bit I don't seem to have further problems. The dried bood is effective for me though. -There are also rabbit repellent sprays available as well.
Good Luck -GC

You can find a lot more ideas at Sprinklerman Cove Landscape.