The water hyacinth, a water-dwelling plant known for its invasive nature, has garnered attention and notoriety due to the adverse economic and ecological effects it causes. The petiole of the water hyacinth plant has demonstrated potential as a reinforcing filler in the field of composite material. However, limited studies have explored the dispersion of the WH particle. In this study, both qualitative and quantitative analyses were conducted, examining surface morphologies and conducting tensile and microhardness tests It was discovered that only particle size <212 µm achieved homogenous dispersion within the polymer matrix. Additionally, it was found that particle size has no significant influence on the microhardness performance. These findings would contribute to the development of an effective WH-reinforced polymer composite.