Natural plant fibers are sustainable alternatives to synthetic materials due to their affordability, lightweight nature, and eco-friendliness. However, challenges like high moisture absorption limit their application in polymer matrix reinforcements. Green composites address these challenges, promoting eco-efficiency. This study investigates Plumbago zeylanica L., an edible lowland plant, for fiber characterization and industrial use. Fibers were extracted via alkaline treatment using NaOH. Comprehensive analyses, including chemical composition, FTIR, XRD, TGA, SEM, and tensile testing, revealed exceptional properties. Plumbago zeylanica L. fiber exhibits a tensile strength of 734.33 ± 25 MPa, a Young's modulus of 39 ± 3.22 GPa, and 6.40 % elongation at break, making it ideal for composites. Its composition includes 36.76 % cellulose, 43.6 % hemicellulose, 14.17 % lignin, and 11.08 % moisture content, with a crystallite size of 8.31 nm and a crystallinity index of 68.4 %. High crystallinity enhances mechanical properties, absorption capacity, and chemical reactivity. SEM analysis revealed a rough surface, improving matrix adhesion. These attributes make Plumbago zeylanica L. fiber a promising material for bio-composite, industrial, and biomedical applications, advancing eco-friendly innovation.