One easy way to make your own deer protection is to mix 1 egg, 1/4 cup of water, and 1 tablespoon of cooking oil. Spray this on your roses by putting the mixture in a spray bottle. The egg's smell will keep deer away. Make sure to repeat the mixture after it rains or gets a lot of water because it can be washed away. Keep in mind that homemade repellents can work differently based on what deer in your area like to eat and how many other food sources are nearby.