Plastic shrinkage cracks are precursor for durability concerns in concrete. An understandingrnof the phenomenon will lead to diminishing this detriment in the future. The utilization ofrnnatural fibers from agricultural by-products like flax is a glamorous option to developrnsustainable building materials in the construction industry. However, the extraction of flaxrnfiber has not yet been explored in Ethiopia. Experimental investigation on the potential of lowrnvolume content and short flax fiber in resisting restrained plastic shrinkage cracking wasrnperformed. The research focused on assessing the performance of this natural fiber. Threernvolume fractions of flax fiber (0.0185%, 0.035%, and 0.055%) with a length of 25mm wererncompared with the plain restrained slab specimen exposed to an environmental chamber whichrninduced high evaporation rate to promote the plastic shrinkage cracking. In order to enhancernadhesion between the fiber and matrix, the surface of flax fiber was coated with cement grout.rnImage analysis technique was used to determine the crack width and length distribution usingrnMATLAB functions and also a crack control efficiency was deliberated. rnThe research work outcome indicates that at a volume fraction of 0.035% total crack areasrnwere reduced by 73% relative to plain specimens and multiple localized cracks of the averagernwidth reduced by 70% limited to less than 0.49 mm. Finally, an optimum fiber content wasrnobtained at 0.055% which has practically eliminated the visually visible restrained plasticrnshrinkage cracking.