Agastache. Perennial. Whorls of pink, purple, blue, red, or orange flowers in spikelike clusters in summer. Sun or part shade. Zones vary by species.
Bee balm (Monarda didyma). Perennial. Blooms in shades of lavender, red, or pink on bushy plants in summer. Light shade in hottest climates. Zones A2, A3, 1-11, 14-17.
Bird of paradise (Caesalpinia). Evergreen or deciduous shrub or tree. Colorful blossoms of yellow or brilliant orange-red above ferny foliage in summer. Sun. Zones vary by species.
California fuchsia (Zauschneria). Shrubby perennial. Tubular, orange to red blooms above gray-green to silvery foliage in late summer or fall. Sun. Zones 2-11, 14-24.
Cardinal flower (Lobelia cardinalis). Perennial. Spikes of flame red flowers in summer. A bog plant in nature, it needs moist soil. Full sun or part shade. Zones 1-7, 14-17.
Columbine (Aquilegia). Perennials. Lacy foliage and delicate flowers in shades of yellow, orange, blue, and red in spring and early summer. Sun or light shade. Zones vary by species.
Coral bells (Heuchera sanguinea). Perennial. Bell-shaped, bright red or coral pink flowers spring into summer. Shade. Zones A1-A3, 1-11, 14-24.
Foxglove (Digitalis). Perennials and biennials. Tubular flowers in shades of pink to apricot, yellow, and cream atop tall spikes in spring. Exposure needs vary by species. Zones vary by species.
Fuchsia. Evergreen and deciduous shrubs. Bell-shaped flowers in a range of pink to purple and orange shades, from late spring to first frost. F. triphylla 'Gartenmeister Bonstedt' has drooping clusters of intense orange, long-tubed flowers. Sun to light shade. Zones vary by species.
Red yucca (Hesperaloe parviflora). Perennial. Rose red to bright red flowers late spring through summer. Sun to light shade. Zones 2b, 3, 7-16, 18-24.
Veronica. Perennial. Masses of small flowers in white, rose, pink, or blue in pointy-topped spikes. Most take full sun. Zones vary by species.
Abelia. Evergreen to deciduous shrub. Small bell-shaped blossoms of pink, red, or lilac on graceful, arching branches in summer to early fall. Sun, some shade. Zones vary by species.
Aster. Many kinds and colors (mostly shades of pink to purple), with daisylike blooms. A. x frikartii is one of our favorites; it bears lilac blooms early summer to fall. Sun. Zones 2b-24.
Bluebeard (Caryopteris). Deciduous shrub. Small clusters of blue flowers from midsummer to frost. Sun. Zones vary by species.
Coreopsis. Perennials and annuals. Profusion of yellow, orange, maroon, or red flowers in spring and summer, depending on species. Sun. Zones vary by species.
Goldenrod (Solidago). Perennial. Large branching clusters of small bright yellow flowers from mid- or late summer into fall. Zones 1-11, 14-23.
Jupiter's beard (Centranthus ruber). Perennial. Flowers of deep crimson to pink and white in dense terminal clusters in late spring, early summer. Sun or partial shade. Zones 2-9, 12-24, H1.
Lavender (Lavandula). Evergreen shrubs. Silvery to green mounds capped with spikes of lavender to purple, pink blooms late spring and summer. Sun. Zones vary by species.
Lilac (Syringa). Deciduous shrubs. Big, flamboyant fragrant flower clusters on branch tips in spring. Light shade in hottest climates. Zones vary by species.
Purple coneflower (Echinacea purpurea). Perennial. Pink, white, or orange daisy blooms in summer. Sun. Zones A2, A3, 1-24.
Rosemary (Rosmarinus officinalis). Evergreen shrub. Small blue or white flowers bloom winter through spring. Sun. Zones 4-24, H1, H2.
Shasta daisy (Chrysanthemum maximum). Perennial. Gold-centered, white daisy flowers in summer. Sun. Zones A1-A3, 1-24, H1.
Yarrow (Achillea). Perennials. Flat-topped flower clusters in shades of yellow, white, rose, red, and salmon bloom summer and early fall. Sun. Zones A1-A3, 1-24.