A fence is one way, but here's a link with other information:
I'm going to try Irish Spring soap shavings. I also have netting that I will put around them. Between the rabbits, voles and deer, I'm afraid I'm losing the war.
liquid fence is a great product. You can find it at Home Depot or Lowes. You spray whatever plants you want left alone. It keeps deer away as well.
Thank you for all your recommendations, fingers crossed!