The objective of this study was to evaluate the mechanical performance of geotextiles made from natural bers of Syagrus coronata (Mart.) Becc., Thypha domingensis, and Juncus sp. The geotextiles were treated with waterproo ng resin and exposed to biodegradation for 120 days to understand their stress and strain behavior. The geotextiles was treated with colorless wood waterproo ng resin by Hydronorth® to make it less permeable, delay the degradation process, and consequently increase the material's resistance to climatic variables. Subsequently, the geotextiles was subjected to natural degradation on slopes covering an area of 10m². Samples of the exposed material to the degradation processes were collected every 30 days. The ndings reveal that the examined bers, following treatment with waterproo ng resin, exhibit the capability for extended utilization in the eld, with Thypha ber outperforming the other tested bers. These results hold signi cant potential for the incorporation of natural bers in endeavours related to environmental conservation.