What to Plant for Erosion Control on Vermont Slopes

Understanding what to plant for erosion control on Vermont slopes requires combining knowledge of climate, soils, slope geometry, hydrology, and plant ecology. This article provides practical, site-specific guidance, recommended species and mixes, planting techniques, and maintenance essentials tailored to Vermont conditions. Use this as an actionable reference for slopes from gentle hills to steep banks and riparian edges.

Understanding erosion on Vermont slopes

Soil erosion on slopes happens when runoff detaches and transports soil particles. Vermont receives a mix of heavy spring snowmelt and intense summer storms, both of which can generate concentrated flow. Typical Vermont soils range from shallow glacial tills on uplands to deeper, loamy river-bottom soils in valleys. A few fundamental points matter for plant selection and design:

• Steeper slopes increase runoff velocity and reduce infiltration time, demanding faster-establishing and deeper-rooted vegetation.
• Soil texture and depth determine water holding capacity and rooting volume. Sandy soils drain quickly and favor drought-tolerant species; loams retain moisture and support a wider palette.
• Aspect matters: south- and west-facing slopes are hotter and drier; north-facing are cooler and retain snow longer.
• Disturbances such as construction, logging, or trails create bare soil that will erode quickly unless stabilized.

Design principles for planting slopes

Effective erosion control blends living cover with structural and engineering practices where needed. Key principles:

• Stabilize quickly: use fast-germinating temporary cover (annual ryegrass, oats) while slower native plants establish.
• Use diversity: mixes of grasses, forbs, sedges, shrubs, and trees provide layered roots, seasonal growth, and resilience.
• Match plants to microconditions: choose wet-site species for seeps and riparian benches, drought-tolerant species for exposed ridges, and shade-tolerant species under tree canopy.
• Combine living measures with physical controls on steep, concentrated-flow sites: check dams, silt fences, wattles, erosion control blankets, and terraces.
• Favor natives when possible; they are adapted to local soils, climate, and wildlife and help control invasives in the long run.

Plants by functional group

Below are recommended species and why they work. Species lists are focused on plants that perform well in Vermont USDA zones 3-5 and are robust for erosion control.

Grasses and sedges (foundation for slopes)

Grasses provide dense fibrous roots, rapid cover, and soil binding at the surface.

• Festuca rubra (red fescue) – fine fescue suited to dry, acidic, or shaded slopes; low-maintenance.
• Festuca arundinacea (tall fescue) – deep roots, drought tolerant, good for steeper, disturbed slopes.
• Poa pratensis (Kentucky bluegrass) – forms a sod that resists shallow erosion on gentler slopes.
• Lolium perenne (perennial ryegrass) – very fast germination; excellent temporary cover.
• Carex pensylvanica (Pennsylvania sedge) – native turf alternative for dry, shaded slopes; good on slopes with low fertility.
• Carex scoparia (sedge) – tolerant of moist soils and gentle runoff; useful in mixes for transitional moist zones.

For wet seeps, ditches, and riparian edges

Plants for saturated soils and streambanks need flexible stems, dense root mats, and tolerance for inundation.

• Salix spp. (willows, such as Salix purpurea and Salix exigua) – willows root from cuttings and form dense mats that prevent bank collapse.
• Cornus sericea (red osier dogwood) – native shrub with strong root systems and good for bank protection.
• Alnus incana (speckled alder) – nitrogen-fixing, stabilizes wet soils and improves fertility.
• Juncus effusus (soft rush) – forms clumps that slow flow and trap sediment.
• Scirpus atrovirens (green bulrush) – useful in wet meadows and shallow water.

Shrubs and woody perennials

Shrubs anchor mid-slope soils with deeper roots and stabilize talus and benches.

• Amelanchier spp. (serviceberry) – deep-rooted, tolerates a range of soils, good wildlife value.
• Vaccinium angustifolium (lowbush blueberry) – ground-hugging shrub for acidic soils, excellent on upland slopes.
• Spirea alba (meadowsweet) – adaptable native shrub for moist sites.
• Rosa virginiana (Virginia rose) – thicket-forming, stabilizes sandy soils.

Groundcovers and native perennials

Low-growing plants reduce sheet erosion, protect against raindrop impact, and are good for slopes too steep for shrubs.

• Arctostaphylos uva-ursi (kinnikinnick) – evergreen groundcover for well-drained, acidic slopes.
• Heuchera americana (alumroot) – clumping perennial for partial shade slopes.
• Rudbeckia hirta (black-eyed Susan), Solidago spp. (goldenrod), and Aster spp. – native forbs that add rooting diversity and intercept raindrops.

Seed mix recipes and planting rates

Use mixes tuned to site moisture and slope severity. Rates below are approximate and given per 1,000 square feet to be practical for small projects. Adjust for slope steepness and seed purity.

• Dry, exposed slopes (south/west, sandy soils)
• Fine fescue (Festuca ovina / rubra) – 2.0 lb / 1,000 ft2
• Tall fescue – 1.0 lb / 1,000 ft2
• Native forb seed (e.g., Rudbeckia, Solidago) – 0.25 to 0.5 lb / 1,000 ft2
• Mesic slopes (typical Vermont hillside)
• Perennial ryegrass – 1.0 lb / 1,000 ft2 (temporary cover)
• Kentucky bluegrass – 1.5 lb / 1,000 ft2
• Tall fescue – 1.0 lb / 1,000 ft2
• Native forb mix – 0.5 lb / 1,000 ft2
• Wet or riparian transition zones
• Willow live stakes/whips – installed at 1 to 2 stakes per linear foot in high erosion zones
• Red osier dogwood, alder (bare-root shrubs) – spaced 3 to 6 feet apart depending on slope severity
• Juncus and Carex plugs – planted in staggered rows at 6 to 12 inch spacing near waterline

Note: For steep slopes where seed establishment is uncertain, use plugs or container plants for high-value native perennials and shrubs. Plugs have higher initial cost but greater survival and quicker soil reinforcement.

Planting and establishment techniques

Good technique often matters more than species choice.

• Timing: Seed cool-season mixes late summer to early fall (late August to mid-September) when soil is warm and competition from weeds is lower. Spring seeding is possible but faces more competition and variable moisture.
• Seedbed preparation: Lightly roughen or tack the surface to allow seed to contact mineral soil. On severely compacted sites, perform mechanical loosening or deep ripping in strips.
• Erosion control blankets: Install biodegradable straw, coconut coir, or jute blankets on slopes steeper than 3:1 (horizontal:vertical) or where concentrated flow occurs. Secure blankets with staples and ensure seed is in close contact with soil beneath.
• Live fascines and wattles: Place straw wattles or live-stake bundles on contour to slow runoff and trap sediment. Plant live-stake willows and dogwood through or behind wattles.
• Mulch and tackifier: Apply a light straw mulch or use tackifiers to protect seed from birds and erosion until seedlings establish. Avoid dense mulch layers that repel water.
• Live stakes and brush layers: For streambanks, drive live willow or dogwood stakes into the bank at an angle to promote rooting. Layering and brush mattresses can stabilize near-surface soils.

Maintenance and monitoring

Establishment is the most vulnerable period. Plan for at least two growing seasons of active care.

• Water during prolonged dry spells in the first season, focusing on plugs and shrubs.
• Control invasive plants by targeted hand pulling or spot herbicide use; invasives establish rapidly on disturbed slopes.
• Mow temporary covers (perennial ryegrass or oats) only after roots are established; do not scalpe newly establishing native plugs.
• Re-seed thin areas in the first fall or following spring. Temporary covers that fail should be removed or replaced with a more appropriate mix.

Choosing sources and permits

• Use locally sourced native seed when possible. Local ecotypes are better adapted to Vermont soils and climate.
• For work near streams, check state and local regulations. Permits may be required for bank work, and agencies may have specifications for bank stabilizations to protect aquatic habitat.
• Work with conservation districts or NRCS for design guidance and potential cost-share programs.

Practical takeaways and quick checklist

• Assess slope: measure grade, note aspect, map wet zones and concentrated flow paths.
• Stabilize immediately with temporary quick-germinating cover while installing long-term vegetation.
• Use a layered plant palette: fast grasses for surface binding, sedges and forbs for diversity, shrubs and willows for mid-slope anchoring, and trees where appropriate.
• On steep or highly erodible banks, combine plantings with erosion control blankets, wattles, and live stakes.
• Time seeding to late summer/early fall; use plugs or live stakes on steep/dry exposures.
• Monitor for two seasons; replace failures and control invasives early.

Planting for erosion control on Vermont slopes is an investment in landscape resilience. Thoughtful species selection, attention to soil and hydrologic context, and proper establishment techniques will minimize sediment loss, improve water quality, and create diverse, long-lived vegetation that stabilizes the land for decades.