Unfortunately, many plants also offer grazing deer an easy banquet, which is hugely frustrating. Thankfully, many flowers are deer-resistant ... thrives in USDA Zones 4 to 8.
Nepeta catmint (‘Cat’s Pajamas’) plants are true blue bloomers – deer-resistant perennials that bloom all summer long. Nepeta can be grown in USDA zones 3-8 in full sun to partial shade.