Usually, strong-smelling plants go untouched by wildlife.
Also prickly plants with thorns and stickers.
My
deer hate my rosemary so I cut branches off and decorate my
rose bushes so that the deer will leave them alone.
Deer are similar to elk so expect them to do what most wildlife will do.
Invest in fencing or electric fencing might help though not always effective.
Check out the threads on our forum about deer fencing. I imagine with elk it needs to be a lot more substantial.
I have also heard that some folks plant extra for the wildlife. Something like instead of 10 plants maybe plant 20, etc.