I'm having good luck with a newer product called Repellex. It is a pill that you put into the ground when the plant emerges in the spring. The plant takes it up as a systemic and it makes the plant taste too bitter for deer and bunnies.

I just noticed that the deer made a massive attack on some cone flowers and black eyed susans that I didn't pill in the spring. I had some pills left and I put the stuff by the plants figuring the new leaves and buds will have the stuff and maybe keep the critters from feasting.

I wouldn't mind the bunnies and deer if they did get all of the flower buds.

I have good luck with Liquid Fence. The deer were a big problem and ate my hosta. I put the liquid fence on, and the hosta recovered. There is also a granular called Repels All.

I've been getting rolls of flexible fencing and cutting it to size to fit around the plants. My bunnies only seem to go after the plants while they're still young. Once they start blooming, I remove the fencing and they tend to leave it alone. I do this will all bunny favorites.