Landscaping Plants You Can Grow On A Steep Hill

ByEric James Updated on

Navigating a sloped property can feel like a challenge, especially when it comes to keeping soil in place and adding beauty. You’ve got that steep incline, and you’re wondering how to tame it without resorting to endless retaining walls or unsightly concrete. If you’re dreaming of a landscape that’s both functional and attractive, one that can withstand the elements and perhaps even attract local wildlife, you’re in the right place. This guide will explore the best landscaping plants you can grow on a steep hill to create a stable, vibrant, and low-maintenance outdoor space.

We understand the desire to make your outdoor areas more usable and visually appealing, whether you’re a seasoned homesteader or just starting to tackle your yard. Steep slopes present unique opportunities for creative landscaping, and the right plants are your most powerful allies. We’ll cover hardy groundcovers, deep-rooted shrubs, and even some flowering perennials that thrive in challenging conditions, all while helping to prevent soil erosion.

Let’s get your slope looking its best and behaving itself.

Understanding the Challenges of Steep Hillside Landscaping

Steep slopes, often called inclines or embankments, present distinct environmental factors that impact plant survival. The most significant challenge is water runoff. When it rains, water rushes downhill, carrying valuable topsoil with it. This erosion can destabilize the slope over time and wash away nutrients essential for plant growth.

Another factor is sun exposure. Depending on the slope’s orientation, it might receive intense, direct sunlight for long periods, leading to rapid soil drying. Conversely, a north-facing slope might remain perpetually shaded and damp. Soil compaction can also be an issue, making it harder for roots to penetrate and anchor effectively. Understanding these challenges helps us select the right plants and techniques.

Choosing the Right Landscaping Plants You Can Grow on a Steep Hill for Stability

When selecting landscaping plants you can grow on a steep hill, prioritize those with robust root systems. These roots act like a natural net, holding the soil together. Groundcovers are particularly effective as they spread horizontally, creating a dense mat that minimizes surface runoff.

  • Root Depth and Spread: Look for plants known for deep taproots or extensive fibrous root networks. These are your best bet for long-term soil stabilization.
  • Drought Tolerance: Many sloped areas can dry out quickly due to gravity pulling water away. Drought-tolerant species will require less supplemental watering once established.
  • Low Maintenance: Once your plants are settled, you want them to thrive with minimal intervention. This is especially true for larger slopes where constant upkeep is impractical.

Top Groundcovers for Hillside Erosion Control

Groundcovers are the unsung heroes of steep slope landscaping. They spread quickly, forming a dense carpet that smothers weeds and holds soil in place.

Creeping Thyme (Thymus serpyllum)

This low-growing herb is incredibly tough and fragrant. It loves full sun and well-drained soil, making it perfect for sunny slopes. Its shallow, but dense, root system helps bind the soil effectively.

  • Benefits: Excellent for foot traffic areas (though avoid heavy use on very steep slopes), attracts pollinators, and releases a pleasant aroma when brushed against.
  • Planting: Space plants about 6-12 inches apart. It will fill in over time.
See also Where The Cool Grass Grows – Master The Art Of Finding The Best

Creeping Juniper (Juniperus horizontalis)

For a more evergreen solution, creeping junipers are fantastic. Varieties like ‘Wiltonii’ (Blue Rug) spread wide and flat, providing year-round cover and excellent erosion control. They are incredibly hardy and tolerate a wide range of conditions.

  • Benefits: Evergreen cover, extremely drought-tolerant once established, minimal maintenance.
  • Planting: Plant 2-3 feet apart, depending on the mature spread of the cultivar.

Sedum (Stonecrop)

Many sedum varieties are excellent for dry, sunny slopes. They store water in their leaves, making them very drought-resistant. Their succulent nature also means they can tolerate poor soil conditions.

  • Benefits: Offers a variety of textures and colors, attracts butterflies, very low water needs.
  • Planting: Can be planted from divisions or small nursery plants, spaced about 8-18 inches apart.

Hardy Shrubs That Anchor Steep Slopes

Shrubs offer a more substantial presence and deeper root systems than groundcovers, providing significant stability. They can also add structure and seasonal interest to your landscape.

Virginia Creeper (Parthenocissus quinquefolia)

While technically a vine, Virginia Creeper acts like a dense shrub when allowed to spread over a slope. It has a vigorous growth habit and a powerful root system that excels at erosion control. It also provides beautiful fall color.

  • Benefits: Rapid coverage, excellent for stabilizing large areas, vibrant autumn foliage, attracts birds with its berries.
  • Considerations: Can be aggressive; monitor its spread if you have adjacent delicate plantings.

Bush Honeysuckle (Diervilla lonicera)

This native shrub is a workhorse for tough conditions. It’s incredibly hardy, tolerates shade to full sun, and thrives in poor, dry soils. Its dense, spreading root system makes it a prime candidate for hillside planting.

  • Benefits: Adaptable to various light conditions, attracts pollinators, offers subtle seasonal color.
  • Planting: Space 3-5 feet apart for mature coverage.

Sumac (Rhus species)

Many sumac varieties, like Staghorn Sumac (Rhus typhina), are excellent for stabilizing slopes. They spread via root suckers, creating dense thickets with strong root systems. They also offer stunning fall color and interesting seed heads.

  • Benefits: Highly adaptable, provides habitat and food for wildlife, spectacular fall display.
  • Considerations: Can spread aggressively, so choose a location where its spread is desired or manageable.

Perennials That Add Color and Stability to Slopes

Don’t underestimate the power of perennials to add beauty and contribute to slope stabilization. While their root systems might not be as extensive as shrubs, their ability to cover the ground and their resilience make them valuable additions.

Coneflower (Echinacea purpurea)

These iconic prairie flowers are surprisingly tough. They develop strong taproots and are quite drought-tolerant once established, making them ideal for sunny, well-drained slopes. Their cheerful blooms attract a variety of beneficial insects.

  • Benefits: Long bloom time, attracts pollinators and birds, relatively low maintenance, adds vibrant color.
  • Planting: Space 1-2 feet apart. They appreciate good air circulation.

Daylily (Hemerocallis species)

Daylilies are incredibly forgiving plants. They tolerate a wide range of soil types and light conditions and develop fibrous root systems that help bind soil. They offer a burst of color in early to mid-summer.

  • Benefits: Prolific bloomers, adaptable to many conditions, low maintenance, available in countless colors.
  • Planting: Can be planted quite closely together for faster coverage and better soil holding.

Ornamental Grasses

Many ornamental grasses are perfectly suited for slopes. Their fine, fibrous root systems spread widely and deeply, providing excellent soil binding. They also add dynamic texture and movement to the landscape, especially in windy conditions.

  • Popular Choices: Little Bluestem (Schizachyrium scoparium), Switchgrass (Panicum virgatum), and Fescues (Festuca species).
  • Benefits: Excellent erosion control, year-round interest, drought-tolerant, attract wildlife.
  • Planting: Varies by species, but generally 1-3 feet apart.
See also Choose The Perfect Roses For Your Climate – Your Guide To Thriving

Techniques for Planting on Steep Slopes

Simply digging holes and dropping plants into a steep hillside isn’t always enough. Employing specific techniques can greatly improve plant survival and the effectiveness of your slope stabilization efforts.

Creating Planting Terraces or Swales

For steeper slopes, consider creating small planting terraces or contour swales. These are shallow depressions dug along the contour line of the slope. They help capture rainwater, allowing it to soak into the soil rather than running off, and provide a more level spot for plants to establish.

  • How-to: Dig a shallow, wide trench following the contour. You can use the excavated soil to create a slight berm on the downhill side of the swale.
  • Benefits: Reduces runoff velocity, increases water infiltration, provides a more stable planting area.

Hydroseeding for Large Areas

If you have a very large or inaccessible slope, hydroseeding can be an efficient method. This involves spraying a slurry of seed, mulch, fertilizer, and tackifier (an adhesive) onto the soil. The mulch helps retain moisture and protect the seeds.

  • Benefits: Covers large areas quickly, promotes seed germination, provides initial soil protection.
  • Considerations: Best for seed-based groundcovers or grasses; may require professional application.

Using Erosion Control Blankets or Mats

After planting, especially on very steep or newly planted areas, consider using erosion control blankets or mats. These are made from biodegradable materials like straw, coconut fiber, or jute. They are laid over the soil and secured with stakes, holding the soil in place while plants establish their roots.

  • Benefits: Immediate soil protection, retains moisture, suppresses weeds, biodegrades over time.
  • Installation: Lay blankets downhill, overlapping edges, and secure firmly with landscape staples.

Preparing Your Soil for Success on a Steep Incline

Even the toughest plants appreciate good soil preparation. While many hillside plants are chosen for their tolerance of poor conditions, giving them a head start can make a significant difference.

  • Amendments: Loosen compacted soil by digging or using a broadfork. Incorporate compost or other organic matter to improve drainage and fertility. This is especially important if your slope is primarily clay or very rocky.
  • Drainage: Ensure your chosen plants have good drainage. Steep slopes naturally drain well, but compacted soil can create waterlogged pockets.
  • Mulching: After planting and watering, apply a layer of organic mulch (wood chips, shredded bark). Mulch helps retain soil moisture, suppress weeds, and regulate soil temperature, all crucial for plants on a slope.

Maintenance and Long-Term Care for Your Hillside Landscape

Once your plants are in the ground, the initial establishment period is critical. After that, your hillside landscape should become increasingly self-sufficient.

Watering During Establishment

Water new plants deeply and regularly during their first growing season. The frequency will depend on your climate and rainfall, but aim to keep the soil consistently moist, not waterlogged. Watering deeply encourages roots to grow deeper into the soil.

  • Tip: Consider using a soaker hose or drip irrigation system snaked along the contour of the slope to deliver water directly to the root zone without causing runoff.

Weeding

Regularly remove weeds, especially when plants are young. Weeds compete for water, nutrients, and light, and can undermine your erosion control efforts.

Pruning and Deadheading

Prune shrubs as needed to maintain their shape and health. For perennials, deadheading (removing spent flowers) can encourage reblooming and prevent unwanted self-seeding, though leaving some seed heads can provide winter interest and food for birds.

See also What Plants Grow Fast From Seeds – For Your Homestead Or Campsite

Monitoring for Erosion

Periodically check your slope for signs of new erosion, particularly after heavy rains. If you notice bare patches or soil washing away, you may need to add more plants, reinforce your erosion control measures, or adjust your planting strategy.

Landscaping Plants You Can Grow on a Steep Hill: Overcoming Specific Challenges

Let’s consider some common scenarios and how to best address them with your plant choices.

Sunny, Dry Slopes

For slopes baked by the sun with little moisture, focus on drought-tolerant, heat-loving plants.

  • Groundcovers: Sedum, Creeping Thyme, Ice Plant (Delosperma).
  • Shrubs: Juniper, Potentilla, Lavender.
  • Perennials: Coneflower, Yarrow (Achillea), ornamental grasses like Little Bluestem.

Shady, Moist Slopes

Shade on a slope can lead to damp conditions. Choose plants that tolerate these conditions and can still hold soil.

  • Groundcovers: Pachysandra (Japanese Spurge), Vinca Minor (Periwinkle), Ferns.
  • Shrubs: Hydrangea (some varieties), Rhododendron, Azaleas (ensure good drainage within the planting area).
  • Perennials: Hostas, Astilbe, Hellebores.

Steep and Rocky Areas

These areas often have poor soil and excellent drainage. Plants that thrive in rock gardens are often good candidates.

  • Groundcovers: Creeping Sedums, Thyme, Dianthus.
  • Shrubs: Dwarf Junipers, Cotoneaster.
  • Perennials: Penstemon, Coreopsis, Gaillardia.

Frequently Asked Questions About Landscaping Plants You Can Grow on a Steep Hill

What are the best native plants for stabilizing a steep hill?

Native plants are often ideal because they are adapted to local conditions and support local ecosystems. Good choices vary by region, but look for native grasses, groundcovers like native sedges, and shrubs known for deep root systems in your area. Consulting with a local native plant society or nursery is highly recommended.

How far apart should I plant on a steep slope?

Plant spacing depends on the mature size of the plant and how quickly you want coverage. For erosion control, planting closer together (e.g., 6-12 inches for groundcovers, 1-2 feet for smaller perennials) will provide faster and denser cover. For larger shrubs, space them according to their mature width (e.g., 3-5 feet).

Can I use wildflowers on a steep hill?

Yes, many wildflowers, especially those adapted to prairie or meadow environments, can be excellent for slopes. Look for species with strong root systems and those that self-seed moderately. Hydroseeding with a wildflower mix can be an effective way to establish them over large areas.

What if my slope is very steep and prone to landslides?

For extremely steep slopes or areas with a history of landslides, consider professional consultation. While plants are a great solution, structural engineering solutions like retaining walls or terracing might be necessary before or in conjunction with planting. Focus on very aggressive groundcovers and deep-rooted shrubs in these situations.

Embrace Your Sloping Landscape

Transforming a steep hill into a beautiful, stable, and functional part of your outdoor space is entirely achievable. By understanding the challenges and choosing the right landscaping plants you can grow on a steep hill, you can create a vibrant, erosion-resistant landscape that brings you joy for years to come.

Remember, patience is key. It takes time for plants to establish their roots and for the landscape to mature. But with careful selection and a bit of effort, your slope will become a source of pride, not a problem.

Stay safe and happy planting!

Eric James
Latest posts by Eric James (see all)

Similar Posts