Q.Defending shrub roses from deer
I heard this weekend that deer do not like oil of peppermint and would like to know if I can sprinkle some oil or spray on my shrub roses, or if the oil would be too strong and possibly harm the plants? Or could I dilute the oil to a certain ratio with water and spray it on that way? The shrub roses are just beautiful when the deer don’t eat the buds off before they ever get to bloom but, unfortunately, they are eating them like there is no other food out there for them. So frustrating! Thank you for any help you can offer about this.

Here is an excellent article that will help you save your roses!
https://www.gardeningknowhow.com/plant-problems/pests/deer/do-deer-eat-rose-plants.htm