First: the caveat. With the possible exception of spiny Barberries (Berberis) there are no absolutely deer-proof plants. If the herd is large enough, and food is scarce enough, deer have been known to eat almost anything. That said, there are bulbs that are much less palatable to deer. If you have a problem in your neighborhood, it's probably a good idea to plant lots of Daffodils, which are poisonous and quite bitter tasting. The plants here can extend the blooming season, early and late, and also make good color complements to Daffodils.