— Olallie Daylily Gardens, S. Newfane, Vt., 802-348-6614, www.daylilygarden.com. Some 800 varieties of daylilies.

— Harkness Memorial State Park, Waterford, Conn., 860-443-5725, www.harkness.org. "Ocean views, an Italianate mansion, and a series of garden 'rooms."'

— Caprilands Herb Farm, Coventry, Conn., 860-742-7244, www.caprilands.com. Thirty themed gardens — Shakespeare, a "cook's" garden, a medieval garden — adorned with literary quotations.

MID-ATLANTIC:

— Wethersfield, Amenia, N.Y., 845-373-8037. "A marvelous adventure in trompe l'oeil design," according to Harrison and Rosenfeld.

— Stonecrop Gardens, Cold Spring (Putnam County), N.Y., 845-265-2000, www.stonecrop.org. A rock garden where "alpine flowers and other delights" are interspersed amid stones and water, the authors said.

— The Donald M. Kendall Sculpture Gardens at PepsiCo, Purchase, N.Y., 914-253-2000. Contemporary art and flowers.

— Brooklyn Botanic Garden, Brooklyn, N.Y., 718-623-7200, www.bbg.org. Highlights include a Japanese garden, fragrance garden, rose garden and cherry blossom festival (April 29-30).

— Cross Estate Gardens, Bernardsville, N.J., 973-543-4030, www.crossestategardens.org. "An intimate, walled garden that captures an enchanting old-fashioned storybook aura."

— Rutgers Gardens, New Brunswick, N.J., 732-932-8451, rutgersgardens.rutgers.edu. "Teaching gardens include a bamboo forest that brings Asian art to mind."

— Duke Farms, Hillsborough, N.J., 908-722-3700, www.dukefarms.org. Indoor greenhouse gardens on the Doris Duke estate "take you on a voyage from country to country, era to era."

— Bartram's Garden, Philadelphia, 215-729-5281, www.bartramsgarden.org. Historic plantings dating to 1728.

— Cedaridge Farm, Pipersville, Pa., www.derekfell.net. "Impressionist paintings come to life," including Monet's favorite arched bridge.