Many homeowners focus on the wall itself and overlook the slope above it. However, erosion from the upper slope is often what creates long-term pressure behind retaining walls.
Creeping juniper is one of the most effective plants for stabilizing slopes because its dense growth habit and extensive root system help prevent erosion while providing attractive evergreen coverage year-round. Once established, it requires very little maintenance and performs exceptionally well in Cincinnati’s climate.
Native ornamental grasses can also play a valuable role in retaining wall landscapes. Little bluestem develops deep roots that anchor soil while adding beautiful seasonal color. Switchgrass offers similar benefits and works particularly well on larger slopes or within tiered retaining wall designs. Both grasses tolerate clay soils and provide texture, movement, and winter interest.
For homeowners looking to create a more natural landscape, combining these grasses with flowering perennial plants can improve slope stability while enhancing visual appeal. Creeping phlox is another excellent option because it spreads across exposed soil, slowing runoff and helping stabilize the area above the wall.
What Cascading Plants Can You Plant on Top of a Retaining Wall?
The top of the wall is one of the most important planting zones because it often receives the most sun exposure, often sits in full sun, and dries out faster than surrounding areas.
Plants such as creeping thyme, which is aromatic and drought tolerant, creeping phlox, sedum, creeping juniper, little bluestem, and switchgrass all perform well in these conditions. Sedum species are reliable drought tolerant plants for dry climates and thrive in wall crevices with minimal water. Their root systems help stabilize soil, reduce runoff, and prevent erosion, while their growth habits soften the appearance of the wall and create a more natural transition between hardscape and landscape.
Many of these plants also produce attractive blooms or seasonal color, allowing homeowners to add visual interest without sacrificing functionality. When planted thoughtfully, they can improve both the appearance and long-term performance of the retaining wall. Native species are often the best choice when matched to the homeowner’s USDA Hardiness Zone.
Creeping phlox generally needs about 1 inch of water per week so plant roots establish well in this exposed area. When we design retaining wall projects, we often incorporate planting plans from the beginning because the right vegetation contributes to both appearance and structural performance.
If you’re considering a new wall, learn more about our Retaining Wall Installation in Cincinnati services.
Can You Use Climbing Plants on Retaining Walls?
While most retaining wall plantings focus on groundcovers and cascading varieties, certain climbing plants can add vertical interest nearby, and a vertical garden approach on a freestanding support beside the wall is another option.
However, we generally recommend avoiding aggressive climbers directly on masonry retaining walls or a stone wall. Some species can trap moisture against the wall surface or become difficult to control over time, potentially creating maintenance concerns.
Instead, climbing plants such as clematis can be trained on nearby trellises, pergolas, or decorative garden structures adjacent to the wall. This approach delivers the beauty of vertical greenery while protecting the wall itself. These plantings can also provide habitat for beneficial insects and pollinators.
For homeowners who want plants to spill over the wall, trailing vines and cascading plants are usually a better choice. Plants like creeping phlox, creeping thyme, and candytuft create a soft, flowing appearance without the risks associated with aggressive climbing varieties, and Dichondra Silver Falls is another strong option thanks to its drought-tolerant habit, silvery-green leaves, and trailing stems that spill beautifully once established. Creeping Jenny is a low-growing perennial with bright yellow-green foliage that cascades gracefully over the edge, and silver falls can add the same effect in a contrasting tone.
Retaining Wall Planter Ideas for Cincinnati Homes
If you’re looking for retaining wall planter ideas, consider combining plants with different heights, textures, and bloom periods to create a layered, natural appearance.
One popular approach is to place creeping phlox or other trailing vines along the wall edge, ornamental grasses behind them, and flowering perennial plants throughout the bed; creeping phlox blooms in spring, especially in March and April, with vibrant flowers that attract pollinators. Candytuft adds white flowers from late spring into summer and handles poor soil and dry conditions well.Â
Trailing lobelia brings blue blooms all summer long and helps attract pollinators. Creeping jenny adds bright yellow-green foliage and can spread quickly, so it works best where its growth is intentional. This combination creates depth while ensuring there is something visually appealing throughout the growing season.
Native plant gardens are another excellent option for Cincinnati properties. Combining little bluestem, switchgrass, coneflowers, and Black-Eyed Susan creates a low-maintenance landscape that supports pollinators and adapts well to local growing conditions.
For larger slopes, retaining walls can create multiple planting levels that transform challenging terrain into attractive outdoor living spaces. Coral bells work well in terraced settings by adding foliage contrast through varied heights, textures, and colors, while daylilies are dependable perennials for the base of walls where moisture can vary. Purple rock cress is also a strong choice for drought-prone pockets or rocky tiers. Our guide to Retaining Wall Ideas for Sloped Backyards showcases several design strategies that work particularly well for Cincinnati homeowners.
Why Plant Selection Matters for Retaining Wall Longevity
Many homeowners think plant selection is purely cosmetic. In reality, the right plants can significantly influence how well a retaining wall performs over time.
Groundcovers, ornamental grasses, and carefully selected perennial plants help prevent erosion, stabilize surrounding soil, and reduce runoff that can place additional stress on the wall. Filling planting pockets with loamy garden soil also helps roots establish well. These benefits contribute to both the appearance and long-term durability of the structure.
On the other hand, trees and shrubs with aggressive root systems can create drainage problems or increase pressure behind the wall as they mature. By contrast, creeping jenny prefers moist, well-drained soil instead of the driest wall locations. That’s why retaining wall landscaping should always balance aesthetics with structural considerations.
At JPK Landscaping, we combine Landscape Design & Installation expertise with decades of retaining wall experience to create outdoor spaces that are both beautiful and functional.
Proper maintenance after installation is equally important, and proper care includes watering based on each plant’s needs. Services like Mulching & Seasonal Cleanup help protect plant health, suppress weeds, retain soil moisture, and maintain a polished appearance throughout the year. For example, hydrangeas need about 2 inches of water per week, and soil pH affects their bloom color and growth.
When plants and hardscapes are designed together as part of a complete landscape plan, homeowners enjoy a more cohesive outdoor space that complements the surrounding landscape and a retaining wall that performs better for years to come.
FAQs: The Best Retaining Wall Plants in Cincinnati
What are the best trailing vines and creeping phlox for retaining walls?
Many homeowners use the term trailing vines to describe plants that spill gracefully over retaining wall edges. In Cincinnati, creeping phlox, creeping thyme, sedum, candytuft, and Dichondra Silver Falls are among the best options because they tolerate local winters, require minimal maintenance, and can spill beautifully over a stone wall or rock wall; Silver Falls is especially valued for its evergreen foliage, silvery-green color, dark green foliage contrast nearby, and waterfall effect that softens stone and adds natural beauty. It’s drought-tolerant once established, but during establishment or hot periods it still benefits from about 1.5 inches of water weekly, especially around walls set among rocks.
Can climbing plants grow near retaining walls?
Yes. Climbing plants can add visual interest near retaining walls when trained on nearby trellises, fences, or garden structures, and climbing roses are a good option when supported on an arbor or trellis rather than attached to the masonry. New Dawn is a popular example, valued for its flowers and fragrance. We typically recommend avoiding aggressive climbers directly on retaining walls to help preserve drainage and structural integrity.
What drought tolerant plants are best for erosion control on a slope?
Plants with deep or fibrous plant roots provide the best erosion control and help stabilize the slope. Creeping juniper, little bluestem, switchgrass, and creeping phlox are all excellent choices because they help prevent erosion, stabilize soil, and reduce runoff on sloped areas; some low groundcovers also form a dense mat and spread over bare soil better than many other plants. Drought-tolerant options are especially useful in full sun and dry climates above a retaining wall.
