I did not see this suggestion that I read yesterday. They said put vicks salve on a few leaves.
This is what I have done with good success because I get herds in my yard and not occasional bite. I am on 3 acres and I have one acre that I left as woods for them to eat.
I purchased...
Wolf urine that I put in a spray bottle and Spray that occasionally on grocery store plastic bags and hang them on the fence where I see they may have been by the poop evidence.
I put some of the Sweeney's Deer Repellent gadgets. They are covered containers that you put on a stem. That is suppose to trigger flight response to the deer. I suspect it is a wolf urine concoction. Home Depot purchase.
Homemade spray. Onion, Garlic, hot sauce, wolf urine, egg, mixture.
Biondi Deer off work for my deer. I tried every one on the market. Every area deer are different. I do think you have to try them all to see which one your deer do not like.
Nite Guard system. It is a flashing red solar light to fool the deer that they think danger wolf blinking eyes. Of course near that area I spray the wolf urine. So it is a site and smell fix I am using.
I have herds of deer not an occasional walk through deer problem. When I see deer it is 10 or more. I have had as many as 20 deer in the front yard at one time.
I also sprinkle Millorganite 3 times a year.
Finally, their path I have picked up pallets from the grocery store for free. They have trouble walking on these because their feet go through the slat space and they fall down.
I have done everything short of a gun. So far it seems to be working just one hosta had some bites. So I am not sure if that was deer, rabbit, groundhog, etc. since it was only one hosta.