Start with deer-resistant bulbs and use deeroscaping principles to hide the bulbs, create a perimeter, etc. You can read about deeroscaping and deer resistant bulbs at http://www.deer-departed.com/rarely-damaged-bulbs.

If you want more homemade deer repellent recipes, I have posted 12 recipes and readers are posting more. There are also repellent reviews and tips at http://www.deer-departed.com

This is a good list, but keeping deer out is even more complicated. I suggest Deeroscaping, having a whole deer control plan. You can read about deeroscaping and more about repellents at http://www.deer-departed.com