Erosion Control Landscaping
35 proven solutions to stop soil erosion on slopes, hillsides, and bare areas — ground cover plants, retaining walls, bioswales, and planting designs that work.
Design Your Slope Solution →🌿 Ground Cover Plants for Erosion Control
Creeping Juniper (Juniperus horizontalis)
The most widely planted erosion-control ground cover for slopes in North America. Deep-rooting, drought-tolerant, and completely weed-smothering once established. Spreads 6–8 feet wide. Plant 3 feet apart on slopes up to 40% grade. 'Wiltonii' (blue carpet) and 'Bar Harbor' are best for erosion work. Zones 3–9. Near-zero maintenance after year two.
Crown Vetch (Coronilla varia)
Extremely aggressive erosion controller used by highway departments. Spreads rapidly by rhizome, roots deeply, and virtually impossible to kill once established. Pink flowers June–July. Best for large, steep banks where nothing else will grow and control is not needed. Warning: invasive in some states — check local regulations before planting. Zones 3–9.
Creeping Phlox (Phlox subulata)
Beautiful flowering ground cover for moderate slopes (10–25%). Dense mat-forming habit roots firmly and controls erosion while providing spectacular spring bloom (pink, white, purple). Evergreen foliage year-round. Zones 3–9. Plant 12–18 inches apart. Blooms April–May. Unlike purely functional erosion plants, this is also a garden-worthy choice for visible slopes.
Liriope (Liriope muscari)
Clumping ornamental grass-like perennial that roots firmly and forms a weed-smothering mat. Best for moderate slopes, wooded banks, and shaded hillsides where lawn won't grow. Zones 5–10. 12–18 inch spread. Mow or cut back once per year in early spring. Tolerates deep shade — works under trees where other erosion plants fail.
Native Wildflower Mix + Seed
For large bare areas or gentle slopes, a mix of native wildflower and grass seeds establishes a permanent, self-sustaining erosion barrier. Combine quick-establishing annual cover (annual ryegrass) with permanent native perennial and grass seed. Annual ryegrass germinates in 7–10 days to hold soil while natives establish. Cost: $0.05–$0.15 per sq ft in seed.
English Ivy (Hedera helix)
Highly effective erosion controller — roots at every node as stems spread, creating a dense mat. Very fast-growing, shade-tolerant. Warning: invasive in many US states, smothers trees, and should not be planted near natural areas. Best confined to urban/suburban slopes far from natural habitats. Check invasive status in your state before planting.
🧱 Structural Erosion Control
Dry-Stack Stone Retaining Wall
A dry-stack stone retaining wall (no mortar) captures and redirects the energy of water running down a slope, preventing soil movement. Each course of stone acts as a terrace, slowing water and allowing it to infiltrate. For walls under 3 feet, DIY is feasible. Use 1/3 of the wall width as depth (a 12-inch wide base for a 36-inch tall wall). Fill behind the wall with gravel for drainage.
Segmental Retaining Wall Blocks
Manufactured retaining wall blocks (Allan Block, Versa-Lok, Anchor Wall) are engineered for slope stabilization. Set-back angle (1 inch per course) creates a stable gravity wall. Geogrid reinforcement is required for walls over 3–4 feet. Cost: $15–$25 per linear foot DIY for a 2-foot wall. Engineered walls over 4 feet typically require a permit.
Gabion Baskets
Wire mesh cages filled with rocks or rubble gabions are a natural-looking, extremely durable erosion control structure. Permeable (water drains through rather than building pressure), flexible, and self-compacting over time. Plants grow in and through gabions, anchoring them further. Cost: $20–$50 per linear foot for a 3-foot gabion wall. Highly effective for streambanks and high-velocity water areas.
Bioengineered Slope Staking
Willow or dogwood live stakes (cuttings from rooted branches) can be driven directly into a bank with a mallet. They root from the stake itself, creating a dense tangle of deep roots that binds soil. Install in fall or early spring when dormant. Space 12–18 inches apart in staggered rows. This technique is used by engineers to stabilize streambanks and costs nearly nothing.
Erosion Control Blankets (ECBs)
Biodegradable jute, coconut fiber, or straw blankets are staked over freshly seeded slopes to hold soil and seed in place during establishment. The blanket biodegrades in 1–3 years as vegetation establishes. Used by contractors and highway departments as the standard seed-establishment method on slopes. Cost: $0.10–$0.30 per sq ft. Available at landscape supply stores.
💧 Water Management Solutions
Bioswale Design
A bioswale is a vegetated channel that captures, slows, and infiltrates stormwater runoff — preventing erosion by reducing water velocity before it can carry soil. Dig a gently sloped channel 12–18 inches deep, 2–3 feet wide, plant with native water-tolerant plants (rushes, sedges, native grasses), and fill the bottom with gravel. Directs runoff away from eroding areas.
Rain Garden for Downspout Runoff
Downspout water concentrates on a single area and causes severe erosion over time. Redirect to a rain garden: a shallow bowl 6–12 inches deep planted with moisture-tolerant natives. The garden absorbs 30–40% more water than a flat lawn area. Plants include Joe-Pye weed, native sedges, swamp milkweed, cardinal flower. Eliminates erosion at the downspout impact zone.
French Drain Installation
A French drain (perforated pipe in a gravel-filled trench) redirects subsurface water that saturates soil and causes slope failure and erosion. Install at the top of a problem slope to intercept water before it flows downhill. Cost: $10–$15 per linear foot DIY. Slope the pipe 1 inch per 8–10 feet toward an outlet. Cover with filter fabric to prevent silt clogging.
Terracing with Swales Between
Cut a slope into a series of level terraces with flat swales (shallow trenches) between each level. Water falls from terrace to terrace and infiltrates on each flat step instead of running continuously down a bare slope. Each terrace can be planted or hardscaped. The most effective approach for moderate slopes (15–35%) where retaining walls aren't cost-effective.
Check Dams in Gullies
Small rock or log dams installed across an active erosion gully slow water velocity, drop sediment, and gradually fill the gully. Stack rocks or logs across the gully 6–12 inches high every 5–10 feet downslope. These 'check dams' can rehabilitate an active gully over 2–3 seasons. Cost: essentially free if rocks are available on site.
🌄 Slope Planting Designs
Ornamental Grass Hillside
A hillside planted with ornamental grasses (Little Bluestem, Switchgrass, Karl Foerster) provides year-round erosion protection with deep fibrous roots. Grasses move beautifully in wind, provide winter seed for birds, and require cutting back only once per year. Plant at 18-inch spacing on slopes up to 30%. Mulch between plants with wood chips to prevent erosion until they fill in.
Native Shrub Bank Planting
Native shrubs — staghorn sumac (Rhus typhina), native spirea (Spiraea tomentosa), native viburnums, shrub dogwoods — have deeply spreading root systems that make them ideal slope stabilizers. Plant plugs or bare-root shrubs in fall. No watering needed after first year. These woody plants out-anchor non-woody ground covers on steep slopes (30%+).
Daylily Slope Planting
Daylilies (Hemerocallis) are one of the most effective and beautiful erosion-control plants for moderate slopes. Dense tuberous root systems grip soil firmly. Spreads by division to cover large areas. Plant fans 18 inches apart — they'll fill in completely in 2–3 seasons. Blooms for months in summer. Tolerates poor soil and drought once established. Zones 3–10.
Wildflower Meadow Slope
A wildflower meadow on a slope (under 20% grade) provides year-round erosion protection while looking intentional and beautiful. Seed in early fall or spring. Include at least 30% native grasses in the mix to provide the fibrous root structure that holds soil. Maintain: mow once per year in late winter to prevent woody succession. No irrigation, no fertilizer.
Three-Layer Slope Planting
The most effective slope planting combines three layers: (1) deep-rooted shrubs every 8 feet for structural anchoring; (2) clumping perennials every 3 feet for mid-level root density; (3) spreading ground cover filling between everything else for surface soil protection. Each layer provides erosion protection at a different soil depth. This is the professional contractor approach to slope stabilization.
📋 Erosion Control Plant Guide
| Plant | Slope Tolerance | Root Depth | Zones | Drought Tolerance | Maintenance |
|---|---|---|---|---|---|
| Creeping Juniper | Up to 40% | Deep (24–36") | 3–9 | High | Very Low |
| Creeping Phlox | Up to 25% | Moderate (12") | 3–9 | Moderate | Low |
| Liriope | Up to 30% | Moderate (12") | 5–10 | High | Low (1 cut/yr) |
| Daylily | Up to 30% | Moderate (18") | 3–10 | High | Low |
| Little Bluestem | Up to 35% | Deep (24–48") | 3–9 | Very High | 1 cut/year |
| Native Viburnum | Up to 45% | Very Deep | 3–9 | Moderate | Minimal |
| Crown Vetch | Up to 50% | Deep | 3–9 | Very High | Very Low (invasive) |
| Straw/Jute Blanket | Any slope | N/A | All | N/A | None (biodegrades) |
❓ Frequently Asked Questions
What is the best plant to prevent erosion on a slope?
Creeping juniper is the most widely recommended erosion control plant for slopes — deep roots, drought-tolerant, and spreads to form a weed-smothering mat. For flowering options, creeping phlox and daylilies are excellent on moderate slopes. For steep banks (35%+), native shrubs with woody root systems are most effective. Always combine plants with mulch during the establishment period.
How do I stop erosion on a steep slope?
Three-step approach for steep slopes: (1) Install structural reinforcement first — retaining wall, gabions, or live stakes to stop active movement; (2) plant deep-rooted native shrubs and ornamental grasses; (3) cover any bare soil immediately with biodegradable erosion blankets or 3–4 inches of wood chip mulch while plants establish. Never leave bare soil on a slope.
What is the cheapest erosion control?
Seeding with native grasses and wildflowers is the cheapest solution ($0.05–$0.15 per sq ft). Cover with biodegradable jute netting ($0.10–$0.20/sq ft) to hold seed during establishment. Total cost: $0.15–$0.35 per sq ft vs. $8–$20 per sq ft for retaining walls. Works on slopes under 30%. For steeper slopes, live willow/dogwood stakes (nearly free) are the cheapest structural option.
How do I stop soil washing away under a downspout?
Install a downspout extender that directs water at least 6 feet away from the foundation, then terminate into a splash block or buried drain leading to a rain garden. A rain garden (shallow planted depression) 10–20 feet from the house absorbs the runoff. This is the most effective and permanent solution for downspout erosion. Cost: $50–$200 DIY.
Do I need a permit for a retaining wall?
Most jurisdictions require permits for retaining walls over 4 feet high. Some require permits over 2 feet if the wall retains soil near a structure or property line. Always check local building codes. Walls under 4 feet in most areas are permit-free. If in doubt, call your local building department — most are helpful with residential questions.
How do I plant on a very steep slope?
For slopes steeper than 30–35%: (1) Install terrace boards or retaining wall sections across the slope to create planting pockets; (2) plant in the pockets with a mix of shrubs and deep-rooted perennials; (3) apply biodegradable erosion blanket between plants; (4) use drip irrigation for the first season since watering steep slopes is difficult. Anchor mulch with jute netting to prevent it from washing away.
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