July and August represent the height of summer, and the perennial flowers that bloom during these months are perfectly suited to handle the intense heat, long days, and bold sunshine that define the season. These plants have evolved to flourish under demanding conditions, drawing on deep root systems that allow them to access moisture and nutrients even during dry spells. Their resilience makes them some of the most dependable performers in the summer garden.
The colors produced by midsummer perennials tend to be vivid and saturated, reflecting the energy and intensity of the season itself. Blazing yellows, deep reds, electric purples, and bright pinks dominate the landscape, creating a sense of abundance and exuberance. When thoughtfully combined, these plants can transform a garden into a stunning tapestry of color that peaks just as outdoor living and entertaining reach their seasonal high point.
From an ecological standpoint, July and August bloomers are extraordinarily valuable. The peak of summer is when pollinator activity is at its most intense, and these flowers provide an essential and abundant source of nectar and pollen for bees, butterflies, beetles, and a wide variety of other beneficial insects. A garden rich in midsummer perennials essentially becomes a thriving habitat, buzzing with life and supporting the broader health of the local environment.
Maintaining these perennials through the heat of summer requires some attention, but most are surprisingly tough once established. Regular watering during prolonged dry periods, occasional deadheading to encourage continued blooming, and dividing clumps every few years are typically all that is needed. Their ability to return stronger each season, combined with their spectacular midsummer display, makes them an essential and beloved element of any well-planned perennial garden.
Best Flowering Plants For August
Daylily
Daylilies are among the most reliable and carefree perennials a gardener can grow, producing trumpet-shaped blooms in an extraordinary range of colors including yellow, orange, red, pink, purple, and nearly every shade in between. Each individual flower lasts only a single day, but a well-established clump carries so many buds that the display goes on for weeks. They thrive in full sun, tolerate a wide range of soils, and multiply steadily without becoming a nuisance.
Coneflower (Echinacea)
Coneflowers are the backbone of the summer perennial border, producing their distinctive raised, domed centers surrounded by swept-back petals in shades of pink, purple, white, orange, and yellow from July straight through August. They are tough, drought-tolerant plants that thrive in full sun and poor to average soils, asking very little of the gardener in return for their long display. Birds, bees, and butterflies all flock to them, making them one of the most wildlife-friendly perennials available.
Black-Eyed Susan (Rudbeckia)
Few flowers capture the spirit of high summer quite like the golden-yellow blooms of the black-eyed Susan, with their rich dark centers and bright, cheerful petals that seem to radiate warmth. They bloom prolifically from July into August and beyond, forming bushy clumps that look equally at home in formal borders, cottage gardens, and wildflower meadows. They are excellent cut flowers and among the easiest perennials to establish in a new garden.
Lavender
Lavender is one of the most beloved perennials in the world, producing slender spikes of fragrant purple, blue, pink, or white flowers from midsummer onward. Its silvery-grey aromatic foliage is as appealing as the blooms, and the entire plant releases its distinctive scent when brushed or warmed by the sun. It thrives in full sun with excellent drainage and is a favourite stopping point for bees and butterflies throughout its long flowering season.
Catmint
Catmint is a wonderfully versatile, low-maintenance perennial that produces cascading mounds of soft lavender-blue flowers on upright stems throughout summer. If cut back hard after the first main flush in early summer, it will reward the gardener with a generous second bloom in July and August. Its aromatic grey-green foliage is attractive all season long, and it works beautifully as an edging plant along paths, driveways, and borders.
Phlox (Garden Phlox)
Garden phlox is a midsummer showstopper, producing large, domed clusters of sweetly fragrant flowers in shades of pink, red, white, lavender, and bicolor combinations from July well into August. It thrives in full sun with consistent moisture and adds a romantic, cottage-garden atmosphere to any planting. Selecting mildew-resistant varieties ensures the foliage stays healthy and attractive right through the season.
Bee Balm (Monarda)
Bee balm is a vibrant, native perennial that produces shaggy, crown-like flowers in shades of red, pink, purple, and white throughout July and August. True to its name, it is an absolute magnet for bees, butterflies, and hummingbirds, making it one of the most wildlife-friendly additions to any summer border. Its aromatic leaves carry a pleasant minty fragrance, and it spreads steadily over time to form impressive, colorful drifts.
Agastache (Hyssop)
Agastache, sometimes called hummingbird mint, produces tall, upright spikes of tiny tubular flowers in shades of purple, blue, orange, pink, and coral throughout the hottest weeks of summer. The entire plant is intensely fragrant, and its nectar-rich flowers draw hummingbirds, bees, and butterflies in remarkable numbers. It thrives in hot, sunny conditions with well-drained soil and becomes more drought-tolerant as it matures.
Russian Sage
Russian sage is a tall, airy perennial that cloaks itself in a haze of tiny lavender-blue flowers from midsummer onward, creating an almost cloud-like effect in the border. Its deeply cut, silvery-white aromatic foliage is as beautiful as the flowers and pairs wonderfully with roses, ornamental grasses, and bold-colored perennials. It is exceptionally drought-tolerant once established and thrives in hot, dry, sunny conditions.
Salvia (Perennial Salvia)
Perennial salvias are workhorses of the summer garden, producing tall, dense spikes of flowers in rich shades of blue, purple, pink, red, and white from early summer right through the heart of the season. They thrive in full sun and well-drained soil, and many varieties will push out a second flush of blooms if cut back after the first wave fades. Bees and butterflies are irresistibly drawn to their nectar-packed flowers.
Yarrow (Achillea)
Yarrow is a tough, adaptable perennial that produces flat-topped flower heads in shades of yellow, white, pink, red, and terracotta throughout July and August. It thrives in hot, dry conditions where many other perennials struggle, making it an excellent choice for low-maintenance and drought-tolerant gardens. Its ferny, aromatic foliage is attractive even when the plant is not in bloom, and it dries beautifully for use in arrangements.
12. Hemerocallis (Stella de Oro Daylily)
Stella de Oro is one of the most popular compact daylily varieties ever developed, producing a prolific display of golden-yellow blooms on short, tidy stems throughout summer. Unlike many daylilies that bloom for just a few weeks, this reblooming variety can flower nearly continuously from June right through August with proper deadheading. It is perfect for the front of borders, container planting, and mass ground-cover displays.
Heliopsis (False Sunflower)
Heliopsis looks like a sunflower but behaves like a dependable garden perennial, returning year after year with a generous crop of bright yellow blooms throughout July and August. It tolerates heat, drought, and poor soils better than true sunflowers, and its long-lasting cut flowers are excellent for bringing summer color indoors. Some varieties feature attractive dark-centered or semi-double flowers that add extra visual interest to borders.
Crocosmia
Crocosmia brings a bold, tropical energy to the midsummer garden with its arching sprays of vivid tubular flowers in blazing shades of red, orange, and yellow. Its sword-like foliage is ornamental in its own right, providing elegant structure in the border even before the flowers appear. It spreads steadily through underground corms to form impressive clumps and is particularly beloved by hummingbirds.
Liatris (Blazing Star)
Liatris is a striking native perennial that produces tall, bottle-brush-like spikes of bright purple or white flowers from the top down in an unusual blooming pattern that sets it apart from most other summer perennials. It thrives in full sun and well-drained soil and is exceptionally drought-tolerant once established from its corm-like roots. Butterflies, especially the monarch, are strongly attracted to its vivid purple blooms throughout July and August.
Shasta Daisy
Shasta daisies are bright, cheerful perennials that produce classic white petals around sunny yellow centers in abundant quantities throughout July and August. They bring a fresh, clean look to borders and cutting gardens and are among the most satisfying flowers to grow for bouquets. Regular deadheading keeps the plants tidy and encourages a continuous supply of new blooms throughout the height of summer.
Kniphofia (Red Hot Poker)
Red hot pokers make a dramatic, eye-catching statement in the July and August garden with their tall, torch-like flower spikes in fiery combinations of red, orange, and yellow. They thrive in full sun with excellent drainage and add architectural height and bold color to the border. Hummingbirds are particularly attracted to the tubular flowers, and the plants become more impressive and floriferous with each passing year.
Helenium (Sneezeweed)
Helenium begins its long flowering season in July, producing masses of daisy-like flowers in rich, warm shades of yellow, orange, bronze, and mahogany that deepen in intensity as summer progresses into autumn. It prefers a sunny spot with consistently moist soil and rewards regular deadheading with an almost uninterrupted display of blooms. Its bold, jewel-toned color palette is particularly stunning when combined with ornamental grasses and late-blooming salvias.
Delphinium
Delphiniums are among the most regal of all summer perennials, producing towering spires of flowers in extraordinary shades of deep blue, violet, purple, pink, and white throughout July. They add dramatic vertical structure to borders and are prized by florists for their elegant, long-lasting cut stems. They prefer cool, moist conditions and may push out a second flush of smaller spikes in late summer if cut back hard after the first round of blooms.
Veronica (Speedwell)
Veronica is a neat, dependable border perennial producing upright spikes of tiny flowers in shades of blue, purple, pink, and white throughout the summer months. It is easy to grow, thrives in full sun with average soil, and pairs beautifully with yellow- and white-flowering perennials in mixed borders. Removing faded spikes promptly encourages the plant to branch and produce additional flowers well into August.
Campanula (Bellflower)
Bellflowers are charming, long-blooming perennials that produce clusters or spires of nodding bell-shaped flowers in shades of blue, purple, violet, and white from early summer through August. They come in a wide range of sizes, from low-growing ground-cover types to tall border varieties that add graceful height to plantings. They thrive in sun or partial shade and self-seed gently to gradually fill in and naturalize an area.
Gaillardia (Blanket Flower)
Blanket flowers are exuberant, heat-loving perennials that produce a near-constant display of bold, daisy-like blooms in vivid combinations of red, orange, and yellow throughout July and August. They are exceptionally tolerant of heat, drought, and poor soils, making them ideal for hot, sunny borders that receive little supplemental watering. Their flowers are stunning in cutting gardens and their seed heads attract finches and other small birds as the season winds down.
Astilbe
Astilbe is the queen of the shade perennial garden, producing feathery, plume-like flower spikes in shades of red, pink, white, lavender, and peach throughout midsummer. It thrives in moist, humus-rich soil in partial to full shade, filling difficult spots that many other perennials refuse to occupy. Even after the flowers fade, the plumes dry to a warm brown and continue providing texture and interest well into autumn.
Monkshood (Aconitum)
The early-blooming varieties of monkshood bring their rich, deep blue and violet hooded flower spires to the border in July and August, offering one of the most striking color combinations available to the summer gardener. It prefers partial shade and consistently moist soil, making it an excellent companion for hostas and ferns in woodland-style borders. Its tall, upright form adds strong vertical structure, and its unusual flower shape gives it a mysterious, architectural quality.
Hosta
While grown primarily for their extraordinary foliage, many hostas produce attractive spikes of tubular lavender or white flowers in July and August, rising well above the mounded leaves on tall, slender scapes. Some varieties, particularly those with fragrant white flowers, are genuinely beautiful bloomers as well as foliage plants. Hostas thrive in partial to full shade and moist, rich soil, and they are indispensable for adding lush, bold texture to shaded borders and woodland gardens.
Penstemon (Beardtongue)
Penstemons are graceful, tubular-flowered perennials that produce elegant, airy spikes of blooms in shades of red, pink, purple, blue, and white during July and August. They are particularly attractive to hummingbirds, which hover at each tube-shaped flower in search of nectar. They thrive in full sun with excellent drainage and have a relaxed, naturalistic quality that suits cottage and prairie-style garden designs beautifully.
Scabiosa (Pincushion Flower)
Scabiosa produces delicate, dome-shaped flowers in shades of soft blue, lavender, pink, and white on long, slender stems throughout the summer months. The flowers have a charming, old-fashioned quality, and their unusual pincushion-like centers give them a distinctive texture that sets them apart in the border. They are long-lasting as cut flowers and are irresistible to butterflies, which congregate on them throughout July and August.
Verbena bonariensis (Tall Verbena)
Tall verbena is an airy, see-through perennial that produces clusters of tiny vivid purple flowers at the tips of tall, branching stems throughout July and August. Its open, transparent form allows it to be planted in front of other perennials without blocking them, layering beautifully into mixed plantings of all heights. It self-seeds freely and is one of the most butterfly-friendly plants in the entire summer garden, blooming tirelessly through heat and dry spells with almost no attention required.