This study assessed the feasibility of using aquatic silt as a sustainable component in turfgrass substrates. Five mixtures of silt and vermiculite (0%-100%) were evaluated for their effects on the germination and seedling growth of Festuca elata. Results showed that while 100% silt enhanced seed germination metrics, a 25% silt addition (T2) most effectively promoted seedling growth. Higher silt proportions (>25%) significantly inhibited emergence rate, plant height, and biomass, primarily due to elevated bulk density. Correlation analysis revealed negative associations between seedling performance and bulk density, pH, and nutrient levels. Hydroponic tests with leachates indicated growth stimulation proportional to silt content, suggesting that chemical properties were not inhibitory. These findings highlight that when used moderately, aquatic silt can serve as a viable substrate component, with bulk density being the primary limiting factor.