Top Perennials to Plant in August: A Guide to Choosing Perennials that Will Establish Well in Late Summer for a Robust Display Next Year

As summer begins to wind down, August presents the perfect window to plant perennials that will set the stage for a breathtaking garden next year. The combination of warm soil and ample daylight allows these perennials to establish strong roots before winter arrives. Below, we’ve highlighted some top choices, including the dramatic Perennial Hibiscus, that are perfect for planting this month.

1. Perennial Hibiscus (Rose Mallow)
For those seeking to add a tropical touch to their garden, Perennial Hibiscus is an excellent choice. Renowned for its enormous blooms, which can measure up to 12 inches across, this hardy perennial thrives in sunny areas with well-moisturized soil. Varieties like ‘Lord Baltimore’ and ‘Cherry Cheesecake’ deliver bold color and impact. Planting in August ensures these beauties will establish a strong root system, leading to a stunning display of flowers next summer.

2. Echinacea (Coneflower)
Echinacea, with its striking daisy-like flowers and pollinator-friendly nature, is a must-have for any garden. Planting Echinacea in August gives it the time needed to develop a resilient root system, ensuring it returns with vibrant blooms year after year. Varieties such as ‘Magnus’ or ‘PowWow Wild Berry’ add a splash of color that’s hard to beat.

3. Rudbeckia (Black-Eyed Susan)
Rudbeckia is known for its bright yellow petals and contrasting dark centers, which bring a cheerful presence to any garden. These hardy perennials are drought-tolerant once established and perfect for low-maintenance gardens. Planting in August gives Rudbeckia the head start it needs to thrive and provide vibrant color next spring.

4. Sedum (Stonecrop)
Sedum is a tough, low-maintenance perennial that adds texture and interest to garden beds. Its fleshy leaves store water, making it a great choice for hot, dry spots. Varieties like ‘Autumn Joy’ offer late-season color and establish quickly in warm soil, making them ideal for August planting.

5. Heuchera (Coral Bells)
Heuchera is valued for its stunning foliage, which comes in an array of colors from deep burgundy to bright lime green. August is an excellent time to plant Heuchera, as it allows the plant to establish a strong root system before winter. These perennials are perfect for adding color and texture to shady areas of your garden.

6. Hosta
Hostas are a top choice for filling shady areas with lush, leafy growth. Known for their resilience, Hostas thrive in less sunny spots and create a striking display of greenery. Planting in August gives Hostas the chance to establish before winter, ensuring a full and vibrant display next year.

7. Aster
Asters are late bloomers that add a burst of color to your garden just as other perennials begin to fade. Planting Asters in August allows them to establish roots before winter, so you can enjoy their vibrant purple, pink, or white flowers next fall. They’re also excellent for attracting butterflies to your garden.

8. Phlox
Phlox is known for its sweet fragrance and clusters of colorful blooms. Planting in August gives Phlox ample time to establish, ensuring a full, bushy display of flowers next year. Choose mildew-resistant varieties like ‘David’ for best results.

9. Coreopsis
Coreopsis is an excellent choice for adding long-lasting color to your garden. These bright, cheerful flowers are easy to grow and are known for their extended blooming season. Planting in August ensures they have a strong start, allowing them to flourish in the coming seasons.

10. Daylilies
Daylilies are beloved for their continuous summer blooms. Although they can be planted throughout the growing season, August is particularly beneficial as it allows Daylilies to establish before winter, leading to a more abundant display next summer.

11. Salvia
Salvia, with its vibrant flower spikes, is a must-have for attracting hummingbirds and butterflies. Planting in August gives Salvia the chance to establish itself before winter, ensuring a reliable and beautiful display of blooms next year.

Tips for August Planting
Watering: Ensure consistent moisture for newly planted perennials to help them establish strong roots. Deep watering during dry spells is crucial.
Mulching: A layer of mulch helps retain moisture and keeps roots cool during the warm days of late summer.
Fertilizing: Use a slow-release fertilizer to provide the nutrients necessary for healthy root development.
By planting these perennials in August, you’re preparing your garden for a vibrant and colorful future. Happy gardening from the team at Donaldson’s Greenhouse!