Best Ground Cover for Slopes: Erosion Control That Actually Works
A slope is a mowing hazard and an erosion risk, and the right ground cover solves both. But not every spreading plant qualifies — slope duty demands vigorous growth and deep, extensive roots. Here are the options that hold, ranked by site, plus the ones to avoid.
- Dry, sunny, steep: Creeping juniper
- Sunny, well-drained: Creeping thyme
- Sun, want nitrogen: Clover
- Sunny colour: Creeping phlox
- Larger areas: Native grasses / sedges
- The rule: Vigorous growth + deep roots
- Avoid: Ivy, vinca, Asiatic jasmine (invasive)
- Steep slopes: Add jute/coir netting
Why ground cover beats grass on a slope
Slopes are exactly where grass struggles most: mowing an incline is difficult and dangerous, and bare or thin turf lets rainfall strip topsoil. Ground covers solve both problems at once — they eliminate the mowing hazard entirely and, once established, knit the soil together with roots and shield it from rain impact. As the University of Maryland notes, ground covers work well precisely on steep slopes and awkward angles where grass is hard to maintain. The catch is choosing a plant tough enough for the job.
What actually makes a good slope ground cover
Not every spreading plant holds a slope. Colorado State Extension is specific: to prevent soil erosion on a steep slope, a ground cover must have a vigorous growth habit and an extensive root system — dense enough on top to shield the soil and deep enough below to bind it. Two more rules matter: most ground covers won’t take heavy foot traffic (so build a path first if you’ll cross the slope), and none are truly no-maintenance — all need weeding, water, and mulch to establish. The best slope plant is one that spreads fast, roots deep, and suits your sun, drainage, and USDA hardiness zone — always confirm a plant is hardy in your zone before planting.
Top slope ground covers, ranked
Creeping juniper — dry, sunny, steep slopes
The workhorse for tough slopes. Clemson calls junipers landscape workhorses for controlling slope erosion, and NC State’s profile of ‘Blue Rug’ creeping juniper highlights a dense trailing form ideal for erosion control that, unlike other junipers, tolerates the dry soil of sunny slopes where runoff dries the ground. Evergreen, drought-tolerant, low-care, and hardy across USDA zones 3–9 (down to −30°F). Best for banks you want to plant once and leave.
Creeping thyme — sunny, sharply drained slopes
For a lower, flowering, walkable option on a sunny slope with good drainage, creeping thyme forms a dense fragrant mat that holds soil and needs little water once established. It wants full sun and sharp drainage (USDA zones 4–9), and offers bloom and pollinator value juniper can’t. See our creeping thyme guide.
Clover — sunny slopes where you want free fertility
White clover spreads densely, roots to improve soil porosity, and fixes its own nitrogen — useful on poor slope soils. It greens through summer and tolerates more traffic than most (USDA zones 3–9), though it prefers a bit more moisture than juniper or thyme.
Creeping phlox — sunny slopes you want in colour
Penn State lists creeping phlox (Phlox stolonifera) as good for erosion control on well-draining soil — drought-tolerant after year one and covered in spring bloom. A strong choice where you want a sheet of colour holding a sunny bank.
Native grasses & sedges — larger slopes
For bigger areas, NC State and Penn State point to deep-rooted native grasses and sedges (and river oats, which develops a firm root mass) in mass plantings. Once established they need infrequent or no mowing — ideal for large steep slopes, with the deepest soil-binding roots of any option here.
What not to plant on a slope
How to plant ground cover on a slope
Prep and test the soil
Remove existing grass and weeds, test the soil, and add any needed amendments before planting. Leaving the cleared area a couple of weeks lets perennial weeds regrow so you can remove them first.
Stabilise steep ground with netting
On steep slopes, lay biodegradable jute or coir netting to hold soil while plants establish, and plant through it. It decomposes as the deep roots take over. Do any liming or fertilising before laying fabric.
Plant in spring or fall, in drifts
Plant when it’s cool so roots establish before summer stress, spacing per the species and mixing a few species in drifts rather than one monoculture. Match each plant to the slope’s sun and drainage.
Mulch, water, and weed to establish
Apply a couple of inches of binding mulch (shredded bark, pine needles) to suppress weeds and hold moisture, water through the first year, then taper off. After establishment, most of these need very little.
Is a ground cover slope right for you?
✅ Good fit
- A slope that’s hard or dangerous to mow
- Visible erosion or runoff to control
- You’ll do first-year establishment care
- Sun and drainage you can match to a plant
- You want low long-term maintenance
⚠️ Think twice
- Slope over ~45° or actively gullying (get grading)
- You need an instant fix (roots take a year)
- Heavy foot traffic across the slope
- You won’t weed or mulch while it establishes
- Deep shade with no suited species
The verdict
For most dry, sunny slopes, creeping juniper is the toughest, lowest-care choice — dense, deep-rooted, drought-proof, and evergreen. If you want something lower and flowering, creeping thyme or creeping phlox hold a sunny, well-drained bank beautifully, and clover adds free fertility on poor soil.
For large slopes, deep-rooted native grasses and sedges give the strongest soil binding with almost no mowing. Whatever you choose, plant in drifts of several species rather than a single monoculture.
The two rules that decide success: pick a plant with vigorous growth and deep roots that matches your site, and protect the soil with biodegradable netting and mulch — never plastic — while it establishes.
Seed a low, flowering slope cover
For a sunny, well-drained slope, creeping thyme seed gives a fragrant, soil-holding mat, and HearthClover™ white clover adds nitrogen on poor ground. Browse all ground covers to match a plant to your slope.
Explore ground covers →What not to do
Frequently asked questions
What is the best ground cover for a steep slope?
For dry, sunny, steep slopes, creeping juniper is the toughest low-care choice — dense, deep-rooted, and drought-proof. For larger slopes, deep-rooted native grasses and sedges bind soil best. The right pick always matches your sun, soil, and steepness.
What makes a ground cover good for erosion control?
Colorado State Extension says it needs a vigorous growth habit and an extensive root system — dense enough on top to shield soil from rain and deep enough below to bind it. Fast-spreading alone isn’t enough; the roots do the real work.
Which ground covers should I avoid on slopes?
Avoid invasive species — NC State names English ivy, vinca (periwinkle), and Asiatic jasmine specifically. They spread unchecked into natural areas, and some leave bare patches where erosion restarts. Choose non-invasive, ideally native, options instead.
Can I just plant one type of ground cover?
It’s better not to. Penn State recommends drifts of several species rather than a single monoculture, so that if disease or pests strike, the whole slope doesn’t fail at once. A mix is also more attractive and resilient.
Do I need landscape fabric on a slope?
Use biodegradable jute or coir netting on steep slopes to hold soil while plants establish — it decomposes as roots take over. Avoid plastic or synthetic fabric: Penn State warns it can increase erosion and runoff and harm soil health.
How long until a slope is stabilised?
Expect meaningful coverage within two to three growing seasons, with the strongest root binding developing over several years. The first year is about establishment care — weeding, watering, and mulching — while the roots that do the holding grow in.
Plant selection, erosion-control criteria, invasive-species cautions, and slope-planting method cross-checked against Penn State, Colorado State, NC State, and Clemson Extension sources.
A single species is an ingredient. The blend is the answer.
Slope Erosion Control Mix — Festuca rubra + Trifolium repens. Holds a slope; stops erosion. Buy the blend when the job needs more than one plant — the grass carries the wear, the clover feeds it, the flowers feed the bees. Buy the single species when you want one plant, one look, one job.
Sources
- Penn State Extension — Penn State Extension: native groundcovers solve slope challenges – creeping phlox (Phlox stolon
- Colorado State University Extension — CSU Extension: for erosion control on a steep slope, ground cover should have VIGOROUS growth h
- NC State Extension Gardener Plant Toolbox (Blue Rug juniper) — NC State Extension: Blue Rug creeping juniper (Juniperus horizontalis ‘Blue Rug’) lowest-growin
- NC State Cooperative Extension (Henderson County) — NC State Extension (Stabilizing Slopes): options for slopes include grasses (creeping red fescu
- Clemson Cooperative Extension HGIC — Clemson Extension: junipers are landscape workhorses often used for controlling slope erosion,