As you are aware, we have a LOT of rabbits in our area. Cute as they may be, they aren't always a gardener's friend. Keeping rabbits from getting at your plants can be a challenge, unless you have plants that rabbits don't like. The plants listed below should be left alone by rabbits:
Veronica - blooms all summer long and easy to grow
Siberian Iris - blooms a little later than bearded iris and has beautiful foliage
Salvia - great pick for hot dry sites and color all season; attracts hummingbirds
Peony - huge blooms and long-lived; heavy late springtime flowers
Daylily - hardy, low-maintenance, full sun
Allium - easy to grow bulbs from 6-inches tall to 6-feet tall varieties
Anise Hyssop - rugged North American native plant; blooms midsummer to fall
Astilbe - common in shade gardens; feathery plumes
Baptistia - tough, drought tolerant, and bees love it; blooms all the way till first frost
Bee Balm - one of the best plants for pollinators; easy to grow; pretty flowers
Catmint - tolerates head and drought; blooms again when sheared after first bloom
Lavender - considered an ornamental herb, easy to grow and wonderful to smell
Fritillaria - spring blooming bulb; faint skunk smell
Hellebore - also called Lenten Rose - announces the arrival of Spring
Iris - gorgeous frilly flowers and great for cutting. Comes in numerous colors
Lamb's Ear - ground cover with soft, fuzzy, silvery leaves; easy to maintain
Pictured above: Veronica
Pictured below, clockwise from left: siberian iris, bee balm, fritillaria, lamb's ear (bloom), astilbe, allium