Silty soils are particularly prone to erosion, posing serious challenges to slope stability. This vulnerability necessitates effective soil stabilization techniques, yet the specific impacts of vegetation, such as Vetiver grass (Crysopogon zizanioides), on the hydraulic properties of silty soils remain underexplored. This study investigates the influence of Vetiver grass on the infiltration, permeability, and water retention capacity of two silty soil types, low plasticity silt (ML) and intermediate plasticity silt (MI). A controlled experimental setup using soil column apparatus was employed to simulate natural conditions, with measurements taken for infiltration, permeability, root biomass, matric suction, and volumetric moisture content. Soil Water Retention Curves (SWRC) were plotted to assess the impact of Vetiver grass growth on soil properties. The results revealed a significant reduction in infiltration and permeability over time, indicating the grass’s effectiveness in enhancing slope stability. After 120 days, ML soil exhibited the highest root biomass, suggesting improved stability. The increase in root density led to elevated soil suction, driven by enhanced transpiration. These findings offer critical insights into the role of Vetiver grass in stabilizing silty soils, contributing to the development of sustainable bioengineering practices for erosion control and slope stabilization in geotechnical engineering.