The effects of amendment on the growth of Cyperus iria exposed to heavy metal polluted soil was studied. Weighing balance (Setra 480S, USA) was used to weigh 2kg homogenized heavy metal polluted soil from an abandoned metal scrap dumpsite at Ikoku Rivers State Port Harcourt, Nigeria into planting bags which was arranged in 4 plots (A, B, C, and D) in addition to an uncontaminated soil designated as plot E adopting a factorial experimental design. The organic and inorganic amendments were added as: A1: NPK (40g/2kg), A2: NPK (80g/2kg), A3: NPK (120g/2kg), B1: orange peel (100g/2kg), B2: orange peel (200g/2kg), B3: orange peel (300g/2kg), and C1: plantain peel (100g/2kg), C2: plantain peel (200g/2kg), C3: plantain peel (300g/2kg) plot D and E with no amendment stand as control and double control respectively and the test plant was introduced after harmonization. Results showed that organic amendment was very effective in controlling excess production of reactive oxygen species (ROS), while slight increase in ROS expression was shown Cyperus iria grown in NPK treated soil. Highest in oxidative stress production in Cyperus iria grown in polluted control soil (0g amendment). Reduction rate of ROS expression varies with different levels of amendment application, this is shown as: catalase < 300g plantain peel, GSH <100g and 300g orange peel, proline <120g NPK and superoxide dimultase <300g orange peel. Therefore, organic amendment is more efficient in controlling excess ROS production and hence enhance plant tolerability in polluted environment.