I live in a very rural (mountain) area. Deer 'do not read' the books that say a plant is 'toxic' / deer proof / safe from deer, etc. You only need ONE deer that likes a plant for that plant to be GONE.
Knew a lady used to have about 900 different daylilies, farm in the middle of nowhere... asked her why she had no deer. She said Milorganite and Liquid Fence. Two years later, in March, not a lot of food (or snow). Deer dug down and took out about HALF of her daylilies...
She was heart-broken, trying to get some of them back from people she had sold to.
Two solutions that work... 1) very tall fence. 2) gun.