Neither a calla nor a lily, the calla lily—which grows 24 to 36 inches tall—is part of the Jack-in-the-pulpit family. Its trumpet-shape flowers and arrowhead-shape leaves rise directly from rhizomes—no stems needed. This plant helps stretch out the color show in your backyard. When early summer perennials begin to fade, these plants stand ready to unfurl their blossoms in hues that include white, yellow, pink, red, orange, and purple. Worth noting: In the language of flowers, white calla lilies stand for marital bliss and true devotion—which may be why brides use them for everything from their wedding bouquet to table arrangements. Also an expression of sympathy, calla lilies often make appearances at funerals.