What to Plant for Erosion Control in Wisconsin Landscapes

Vegetation is one of the most cost-effective, sustainable ways to reduce soil erosion in Wisconsin. Plants slow runoff, trap sediment, increase infiltration, and bind soil with roots. Choosing the right species for the specific soil moisture, sun exposure, slope, and land use is essential. This article gives practical, site-specific guidance for selecting grasses, sedges, forbs, shrubs, trees, and live stakes that perform well in Wisconsin climates and soil types, and explains planting and maintenance techniques that improve establishment and long-term stability.

How vegetation controls erosion: the key mechanisms

Plants reduce erosion through several interacting effects. Understanding these helps you select species and planting strategies that will actually work.

Plant leaves intercept raindrops, reducing their impact energy and the resulting detachment of soil particles.
Vegetation increases surface roughness and slows runoff, which lowers the water’s ability to move soil.
Roots bind soil particles and form a network that improves shear strength and slope stability.
Plant roots increase infiltration by creating macropores and reducing surface sealing, so less water runs off.
Living plants add organic matter, improving soil structure and long-term resilience.

Site assessment: what to evaluate before you plant

A simple but thorough assessment saves time and money. Record the following for each area you plan to stabilize:

Slope steepness and length (percent slope or degrees).
Soil texture and drainage (sandy, loamy, clay; well drained, seasonally wet, poorly drained).
Sun exposure (full sun, partial shade, full shade).
Proximity to water (streambank, shoreline, wetland, intermittent channel).
Land use and access (mowing, livestock, high foot traffic, vehicle traffic).
Erosion type (sheet, rill, gully, bank undercutting).
Presence of invasive plants to remove before planting.

Plant types and when to use them

Different plant forms address different erosion problems. Use the categories below to match vegetation to site conditions.

Deep-rooted native grasses for open slopes and meadow restoration

Native warm- and cool-season grasses create a fibrous and often deep root network that is excellent for slope reinforcement and long-term cover. Use them on dry to mesic slopes, roadside embankments, and restoration plantings where trees or shrubs are not desired.

Switchgrass (Panicum virgatum): excellent on drier to mesic sites, deep roots, dense clump-forming habit.
Big bluestem (Andropogon gerardii): deep-rooted prairie species for sunny slopes.
Little bluestem (Schizachyrium scoparium): good on dry, lean soils; slower to form a dense sod but very drought tolerant.
Prairie dropseed (Sporobolus heterolepis): fine-textured, useful for erosion control on dry slopes.

Planting note: prairie or grass plugs should be installed fairly dense on steep slopes (6 to 12 inches spacing for rapid cover) or seed at rates recommended by your seed supplier for stabilization mixes; consider increasing density on highly erodible sites.

Sedges, rushes, and wetland grasses for wet slopes and streambanks

On streambanks, shorelines, and seasonally saturated soils, sedges and aquatic grasses reduce undercutting and filter sediment. They tolerate saturated soils where many upland grasses fail.

Tussock sedge (Carex stricta): forms dense tussocks that resist flowing water.
Pennsylvania sedge (Carex pensylvanica): good for shaded, mesic slopes.
Soft rush (Juncus effusus): useful in riparian edges and swales.
Bluejoint reedgrass (Calamagrostis canadensis): common in wet meadows and shorelines.
Swamp milkweed (Asclepias incarnata): a forb that stabilizes wet soils and provides pollinator habitat.

Planting note: use plugs or container plants for sedges and emergent species; live stakes of willow or dogwood can be used in conjunction for immediate bank reinforcement.

Shrubs and woody thickets for bank stability and large erosion problems

Shrubs produce woody root systems that are particularly effective at reinforcing banks and steep slopes. They are appropriate for riparian corridors, roadside embankments, and areas where a shrub layer is desired for habitat or screening.

Red-osier dogwood (Cornus sericea): fast-growing, spreads via suckers, excellent for streambank stabilization.
Nannyberry (Viburnum lentago) and Serviceberry (Amelanchier spp.): useful on less-wet slopes for added root reinforcement and seasonal cover.
Black chokeberry (Aronia melanocarpa) and elderberry (Sambucus canadensis): tolerate wet portions of banks and provide wildlife value.
Willows (Salix spp.): the top choice for active bank repair when installed as live stakes or fascines; they root readily from cuttings.

Planting note: spacing depends on plant size and desired speed of cover. For dense bank protection, expect to plant shrubs 2 to 4 feet apart; live stakes of willow can be installed 12 to 24 inches apart along the toe and mid-slope.

Groundcovers and small perennials for shallow soils and urban slopes

Where soil depth is limited or where low-growing cover is needed to suppress weeds and protect thin topsoil, low shrubs and groundcovers work well.

Creeping juniper (Juniperus horizontalis): drought tolerant, good on sunny, dry embankments (use non-invasive native cultivars).
Wild strawberry (Fragaria virginiana), foamflower (Tiarella cordifolia), and Appalachian violet (Viola spp.): native groundcovers suitable for partial shade or under trees.
Bearberry (Arctostaphylos uva-ursi): a native, low evergreen for dry, sandy soils.

Planting note: groundcovers should be planted in tight spacing (6 to 12 inches) to quickly form a continuous cover.

Live stakes, fascines, and mats: structural-vegetative hybrids

For highly eroding banks and steep channels, use vegetative structural techniques in addition to plants.

Live stakes: dormant woody cuttings (willow, dogwood, alder) inserted into the bank will root and form an immediate network of roots. Stakes should be 2 to 3 feet long and driven two-thirds into the bank; space 12 to 36 inches apart depending on species and erosion severity.
Fascines: bundles of live willow or dogwood stems placed in contour trenches at the slope face help trap sediment and encourage root growth.
Biodegradable erosion control blankets (coir or straw) hold seed and soil in place during establishment and reduce surface wash; combine with seeded or planted vegetation.

Planting timing, methods, and practical tips

Selecting the right time and method improves success rates, especially on slopes and near water.

Planting seasons: fall planting for most perennials and shrubs (after leaf drop but before hard freeze) or spring planting after soils thaw. Live stakes are best installed while dormant in late winter or early spring.
Seed vs. plugs/containers: seed is economical for large areas but slower to establish and more vulnerable to washout. Plugs or container plants establish faster and provide immediate structure; use plugs on steep slopes, high-value sites, or where rapid cover is critical.
Prepare the seedbed: remove invasive species, roughen the surface to encourage root anchorage, and add a thin layer of compost if soils are poor. Do not place topsoil at the toe of slopes where it can wash away; stabilize immediately after planting.
Mulch and anchoring: use straw mulch pinned or tackified on seeded slopes, or biodegradable blankets on steep areas. Avoid synthetic netting unless it is biodegradable and will be removed or will break down.
Erosion control in high flow areas: combine rock (riprap) at the toe with plantings above, and use live staking along the waterline where appropriate.

Maintenance and monitoring during the first three years

Vegetation requires attention in the establishment period to reach full effectiveness.

Watering: container plants and plugs may need supplemental water during dry periods in the first season. Avoid overwatering which can cause slumping on steep slopes.
Weed control: control aggressive annuals and invasive perennials for the first two growing seasons. Hand pulling, targeted mowing, or selective herbicide use may be necessary.
Mowing: for prairie plantings, mow at 4 to 6 inches the first year to reduce annual weeds. Do not mow lower than 4 inches as young native grasses and forbs need height for root development.
Inspection: after major storms, inspect slopes and bank plantings for scouring, exposed roots, or washed-out areas and repair early.
Long-term: after native stands are established, maintenance typically decreases; periodic invasive species control and selective pruning of shrubs/trees will maintain stability and function.

Recommended species lists by site condition

Below are practical, Wisconsin-suitable species organized by common erosion scenarios. Use local ecotype or region-adapted cultivars when available.

Dry, sunny slopes and roadside embankments

Little bluestem (Schizachyrium scoparium)
Big bluestem (Andropogon gerardii)
Prairie dropseed (Sporobolus heterolepis)
Butterfly milkweed (Asclepias tuberosa)
Creeping juniper (Juniperus horizontalis) for low groundcover

Mesic slopes, partial shade, and urban sites

Pennsylvania sedge (Carex pensylvanica)
Wild strawberry (Fragaria virginiana)
Foamflower (Tiarella cordifolia)
Serviceberry (Amelanchier spp.) for shrub/tree layer

Wet slopes, streambanks, and shorelines

Tussock sedge (Carex stricta)
Bluejoint reedgrass (Calamagrostis canadensis)
Soft rush (Juncus effusus)
Red-osier dogwood (Cornus sericea)
Willow species (Salix spp.) installed as live stakes or fascines

High-energy channels and severely eroding banks

Live willow stakes and bundles (Salix spp.)
Red-osier dogwood (Cornus sericea) as anchored live stakes or plantings
Alder (Alnus incana) in very wet toes and low-energy saturated soils

Design and scale considerations: spacing and density guidance

Grass and sedge plugs: for rapid surface protection on slopes, plant plugs 6 to 12 inches on center. On lower-risk slopes, 12 to 24 inches spacing may be acceptable.
Shrubs: plant 2 to 4 feet on center for dense root reinforcement on banks and steep slopes.
Live stakes: 12 to 24 inches apart along the toe and mid-slope for moderate erosion; 6 to 12 inches apart for severe erosion.
Groundcovers: 6 to 12 inches spacing to achieve a continuous mat quickly.

Common pitfalls and how to avoid them

Planting the wrong species for moisture conditions: match species to the site–don’t plant upland plants into saturated soils or expect wetland species to thrive on dry rocky slopes.
Underplanting steep or highly erodible sites: when in doubt, increase planting density and combine structural measures (blankets, fascines) with plants.
Neglecting invasive species: remove or control invasives before planting; they can outcompete young natives and render stabilization efforts ineffective.
Waiting too long to stabilize disturbed soils: exposed soil near water or on steep slopes should be stabilized immediately after grading to prevent a single storm from creating major erosion.

Practical takeaways

Assess site conditions thoroughly and choose plants adapted to moisture, sun, and soil texture.
Use native grasses and sedges for their deep root systems and long-term resilience; combine with shrubs and live stakes where bank strength is needed.
Prefer plugs or container plants on steep slopes and critical sites for quicker establishment; use seed for larger, lower-risk areas.
Employ biodegradable erosion control blankets, live fascines, or riprap at the toe in combination with vegetation where flow energy is high.
Monitor and maintain plantings for the first two to three years: water, weed control, and repair erosion where needed.

Vegetation-based erosion control is a practical, effective approach in Wisconsin landscapes when species selection and planting methods are matched to site conditions. With the right plants, planting density, and early maintenance, you can restore function, reduce sediment loss, and enhance habitat and aesthetics at the same time.