Recent scientific studies in structural rehabilitation have introduced Textile Reinforced Mortar (TRM) composites as an innovative solution for the enhancement of existing concrete and masonry structures, as well as for seismic upgrades and the conservation of historical and cultural heritage. Considerable advancements have been achieved in industrial methodologies, with a focus on rehabilitation, reuse, and renewal. For this reason, research investigations have centered on assessing bio-Natural Textile Reinforced Mortar (bio-NTRM) systems, utilizing natural fibers such as flax and hemp as sustainable, renewable, and cost-effective alternatives to conventional, more invasive reinforcement techniques and polymer-based composites that employ materials like carbon, glass, basalt, and PBO. Nevertheless, the number of experimental data on these novel materials remain relatively limited. Thus, this document presents the preliminary experimental findings on the mechanical properties of bio-NTRM made with flax textiles and an inorganic mortar matrix, according to TRM standards. Specifically, direct tensile tests on bare flax textiles and bio-NTRM samples are conducted. This experimental program is part of a broader research effort on bio-NTRM systems, aiming to provide the essential knowledge required to design these solutions to meet the specific needs of existing structures.