Phlomis russeliana (Sticky Jerusalem sage)

Daylilies are classic, extremely popular garden plants. They feature long, arching, strappy leaves and long stems of generally 6-petaled flowers, though double flowers are popular as well. Each flower lasts only one day, hence the plant’s common name. Daylilies come in a wide range of colors, from cream and cheery yellow to peach, orange, fiery red, deep burgundy, pink, and purple. Some have contrasting throats and "eye-zones." Daylilies are ideal for a mixed herbaceous perennial border.

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This species has bluntly spurred golden yellow flowers from late spring to early fall. Its pale green, glaucous leaves form compact, ferny mounds.

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Serbian bellflowers have an easy, undemanding habit. Creating a stream of lavender blue, the 1-inch-diameter star-shaped blossoms bloom reliably from late spring to early fall. The foliage remains evergreen in mild winters and needs to be sheared only once in a while to keep its appearance tidy. 'Blue Waterfall' flows beautifully along bed edges and through rock gardens in full sun to partial shade.

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This annual, biennial, or short-lived perennial is grown for its long season of pansy flowers in shades of purple, blue, yellow, and white. Viola tricolor is pretty in containers, as edging, or as a companion for bulbs. It self-seeds readily.