Nanotechnology has grabbed global attention due to its stability, small size, compatibility, selectivity and surface area. It has been studied that the metal nano-particles are toxic, costly and eventually harming the environment. To overcome the side effect of chemicals, phytogenic nanoparticles seems to be an efficient tool to clean this environmental mess. These particles are cost effective, eco-friendly, and rapid, hence, a promising technology in wide area of science. Water scarcity being one of the largest concerns can be reduced using phytogenic technology. These particles are prepared using plant extracts and natural sources with low energy avoiding hazardous and toxic chemicals. This review focuses on various processing parameters responsible for controlled shape, size and morphology of phytogenic nanoparticles and its importance in water treatment. Our study aims to explore synthesis of iron oxide nanoparticles via phytogenic process and its applications in waste water treatment.