I created a deer test garden to determine exactly what is deer proof for our immediate area during all the seasons. When they are hungry enough or curious they will try just about anything. Several deer meander by daily always investigating what I have recently planted. Thus far, I can say with confidence that they will not eat the following:
Lavandula sp.- lavender, Digitalis sp. foxglove, Nepeta - catmint, ferns, Asclepias tuberosa - butterfly weed, milkweed, magnolia, gingko tree, thistle, Paeonia - peonies, spirea, Caryopteris –blue mist spirea, Helleborus sp. - hellebores, and Solidago sp. - goldenrod.
I have found many plants that appear on deer resistant plant lists to actually still be eaten such as: Lindera benzoin (spicebush), Viburnum spp, hollies, forsythia, weigula, especially young plants.