Deer resistant geophytes include Amaryllidaceae and Araceae. More specifically, as observed in my garden - Allium, Anemone, Arisaema, Calla, Caladium, Chionodoxa, Eranthis, Fritillaria, Galanthus, Leucojum, Narcissus, Scilla are generally left alone. They'll nibble the tips of emerging Hyacinthoides but don't really do much damage. Leave Mertensia alone. Among the non-geophytes deer tend not to eat ornamental grasses, ferns, plants with strongly scented foliage, plants with fuzzy leaves. Be aware that different herds eat different plants - there's one group in New Jersey that eats pachysandra. Does eat different plants while pregnant and lactating than they tend to eat at other times. Fawns learn what to eat from their mother does so it varies from herd to herd. They all seem to love hosta and tulips. Judy in absurdly warm New Jersey