Vetiver is a living hedge that helps hold ground in place.

Planted in dense rows, vetiver slows runoff, traps sediment, and helps stabilize slopes, fields, roads, and degraded land.

Reported results, not promises. The figures on this page come from published cases and technical references, and vary by site.

Vetiver hedgerows protecting roadside from erosion

Contour rows show the method in place: plant material, spacing, and site design working together.

What is the Vetiver System?

A plant, or a method?

The Vetiver System is not just a plant. It is a field method that uses a sterile vetiver cultivar, planted in narrow dense hedges, to slow water, trap sediment, and strengthen soil over time.

Uses a sterile, vegetatively propagated cultivar
Requires correct plant material and careful establishment
Works because of the spacing, density, and site-appropriate design

Why vetiver is different

Key features that make the system work

Deep roots, no rhizomes

The bioengineering cultivar produces neither stolons nor rhizomes, and roots can reach 3–4 m in the first year under some conditions.

Narrow hedge, real hydraulic effect

Planted closely, vetiver forms a living filter that slows and spreads runoff while trapping sediment.

The right vetiver matters

For bioengineering, the reference plant is a sterile, vegetatively propagated cultivar; not all vetiver species are interchangeable.

Often lower-cost, never context-free

Several cases report lower costs than heavy engineering, but only in clearly described contexts.

What vetiver can help with

Specific applications where the Vetiver System has been documented

Soil erosion

Slowing and filtering runoff to reduce soil loss on vulnerable slopes and fields.

Runoff and water management

Spreading and slowing moving water so more infiltrates into the landscape.

Slope stabilization

Strengthening hillsides and protecting roads, terraces, and infrastructure.

Road edges, embankments, canals, banks

Protecting linear infrastructure from edge failure and undercutting.

Degraded land and gullies

Supporting recovery on severely eroded or damaged ground.

Agriculture on slopes

Protecting uphill fields while supporting crop production.

Sediment and agrochemical filtering

Trapping silt and some runoff-transported residues.

Field evidence

The system is read through sites, not slogans.

Photos from VSF field folders show where vetiver is planted, what it is asked to protect, and how recovery is followed over time.

Vetiver planted in contour rows across a cultivated hillside. — Contour planting

Vetiver hedges established across a cultivated hillside. — Hillside protection

Before and after field comparison showing vegetation recovery on a hillside. — Recovery over time

Reported results, not promises

What the research shows

The studies and cases cited here show substantial reductions in runoff, soil loss, and sometimes costs. Actual performance still depends on climate, soil, slope, spacing, hedge age, and establishment quality.

Key cautions:

•These figures show the range of documented outcomes. They are not universal guarantees. Results depend strongly on site selection, design, implementation quality, and ongoing observation.
•Some documented cases report lower costs than hard engineering alternatives, but cost varies by site, labor, slope, materials, and maintenance.

90%

Soil-loss reduction

Reported up to 90% soil-loss reduction as a TVNI benchmark.

Source: TVNI Technical Reference Manual

70%

Runoff reduction

Reported up to 70% runoff reduction as a TVNI/manual benchmark.

Source: TVNI Technical Reference Manual

69% & 76%

ICRISAT case results

69% runoff reduction and 76% soil-loss reduction.

Source: ICRISAT on-farm research

62% & 56–62%

Ethiopia case results

62% runoff reduction and 56–62% soil-loss reduction on 9% slope.

Source: Jijiga erosion control study

31–69% & 62–86%

Thailand peer-reviewed study

31–69% runoff reduction and 62–86% soil-loss reduction on steep slopes.

Source: Donjadee & Tingsanchali 2013

11.6% → 3.6% & 142 → 1.3 t/ha

Colombia CIAT cassava case

Runoff from 11.6% to 3.6% of rainfall; soil loss from 142 t/ha to 1.3 t/ha. Marked as spectacular but highly context-specific.

Source: CIAT cassava intercropping study

How the Vetiver System works

A five-step field method

The Vetiver System is not automatic. It requires careful planning and adaptive management.

Read the site

Assess slope, soil, rainfall, erosion paths, water flow, access, and local land use before deciding to plant.

Prepare healthy plants

Source or grow correct plant material from reliable nursery stock. Plant material matters.

Design the lines

Mark contours or layouts before planting. Proper spacing and alignment are critical.

Establish the hedge

Plant firmly, water, weed, protect, and fill gaps early. First-year care is intensive.

Maintain and observe

Trim, replace weak plants, document sediment and survival, and adapt based on what you observe.

Establishment timeline (one documented context): Establishment timeline varies by context: slope stabilization in a documented road-slope case began around 3–4 months; roots observed at 68–85 cm at 6 months, 70–120 cm at 12 months, and 120–187 cm at 24 months. Frame this as one documented context, not a universal growth curve.

What vetiver is not

Clarity on where the system does not work

Vetiver is powerful, but it is not magic. It is not a replacement for engineering in every situation, and it does not work well when planted without planning, follow-up, or local ownership.

Not an instant fix

Establishment takes time; results build over seasons, not weeks.

Not a substitute for geotechnical assessment

Where a slope is internally unstable or structurally compromised, engineering assessment is required before planting.

Not "any vetiver"

Plant material matters. The bioengineering cultivar is sterile and vegetatively propagated. Not all vetiver species are interchangeable or safe to plant.

Not maintenance-free during establishment

First-year care includes watering, weeding, protection, and gap-filling. Neglect leads to failure.

Not a universal solution for every site

Wet season timing, soil depth, slope angle, access to water, and local commitment all affect success.

Why VSF works with vetiver

Our role is guidance, not selling a miracle solution.

We help partners understand where the Vetiver System fits, how to implement it correctly, and what is actually happening on the ground.

VSF explains the Vetiver System in plain language.
VSF helps read sites before recommending planting.
VSF supports nurseries, layout, planting, and follow-up.
VSF separates published benchmarks from field observations.
VSF makes public tracking understandable when data is available.

Next steps

Choose how you want to engage.

Whether you are learning, piloting, supporting, or implementing at scale, there is a starting point.

Understand the Vetiver System See projects and public tracking Discuss a site or partnership Support our work

Sources and resources

All claims on this page are traced to published research, technical manuals, or documented case studies.