Vibrant Perennial Flowers That Bloom All Summer

Sunny gold Stella d'Oro daylily lights up the garden with its trumpet-shape yellow flowers all summer long. This tough summer perennial scoffs at hot, dry conditions. Here it creates a spectacular combination with blue ornamental onion (Allium azureum).

Noted for its reliable show of snowy-white flowers in spring and again in fall, this stunning tall bearded iris is among the easiest perennials to grow. The ruffled blooms are borne on 30-inch-tall stems above the swordlike foliage.

Enjoy lilac's heady fragrance in spring, and again from midsummer into fall with Bloomerang. This compact variety fits neatly in any garden as it grows just 4 to 5 feet tall and wide. It bears a heavy crop of lavender-purple flowers that are perfect for cutting.

Most hydrangeas bloom once and are done for the season. But Endless Summer bears blossoms on new growth—so you can enjoy the flowers several times each summer. For gardeners in cold climates where winter damage prevents other hydrangeas from flowering, ‘Endless Summer’ ensures a spectacular show.

Beautiful Knock Out roses are truly some of the easiest plants you can grow in your garden. They bloom almost continuously through the summer and are virtually disease free and hardy to boot. Shown here is Pink Double Knock Out; the series also includes red, double red, single pink, yellow, and more.

Jazz up your garden with Jackmanii clematis. Its royal purple petals cover the plant in early summer, and it blooms sporadically the rest of the growing season.

As you might guess from its name, May Night perennial salvia puts on a spectacular show of deep purple spires in late spring. However, if you cut off the flowers as they begin to fade, it blooms again later in summer.

Fringed bleeding heart is the perfect size for semi-shady small-space gardens. And while the old-fashioned types flower just once in spring, this little dynamo blooms throughout the growing season. It slows down in the heat of summer but picks up the pace again in autumn.

Sporting clear purple blooms from late spring through fall freezes, Rozanne geranium makes a colorful statement in part shade to full sun. The spreading plant can reach 3 feet wide, making a mass of beautiful foliage to boot.

The orange tubular flowers of Commotion Tizzy blanket flower give the impression of exploding fireworks. This sizzling sun-lover blooms all season, especially if spent flowers are removed.

Add a delightful dose of vivid pink to your yard with valerian. It blooms nearly nonstop from spring through fall in well-drained sunny sites. Deadhead the plant to prevent it from spreading by seed and to speed rebloom.

Coreopsis, also known as tickseed, produces scores of sunny yellow flowers in summer months. ‘Domino’, pictured here, has a mahogany band near the center of the bloom. Pluck off spent blooms to prevent seed formation and to keep the plant blooming profusely.

The pure white blooms of Becky Shasta daisy brighten the perennial garden with their cheery display. As flowers fade, cut them off and you'll be rewarded with a repeat showing.

Lovely purple flower spikes set off the gray-green foliage of Walker's Low catmint. Give the plant a haircut after its initial flush of flowers in late spring to keep it compact and initiate another cycle of bloom. Count on catmint to be low-maintenance and to stand up to hot and dry conditions.

An unsung hero of the perennial garden, speedwell comes in a variety of shades of blue, pink, or white. All produce upright flower spikes on mounded plants. After the first set of blooms begins to fade, shear the plant to encourage branching and rebloom. This combination of spike speedwell, Knock Out rose, and Six Hills Giant catmint creates a spectacular season-long show.

Rose verbena forms a cascading groundcover that spruces up a slope with season-long bloom. It flowers best in the cooler weather of spring and fall, but it is seldom without some splashes of color.

Butterfly Blue pincushion flower is a nonstop bloomer in the sunny border. The cushion-like blue flowers are borne on slender stalks reaching 12 to 15 inches tall and are a surefire way to attract butterflies.