Contamination of soil with heavy metals is a threatening global environmental problem. With increasing urbanization, it is very important to design economical and environment-friendly mitigation measures to have pollutant free soil. Phytoremediation is an advancing technique to extract pollutants from soil to achieve eco-sustainability. This study was aimed to investigate the combined impact of biochar and silicon on growth attributes of Brachiaria mutica grown in cadmium (Cd) contaminated soil. The biochar was prepared by co-pyrolysis of agricultural left-over biomass (rice husk, bamboo leaves and corn cob in 1:1:1 ratio) and physio-chemical characters were studied by FTIR, SEM-EDX and proximate analysis. A pot study was conducted to evaluate the potency of biochar and silicon in lowering the Cd up take by para grass grown under Cd spiked soil. Total 9 treatments were planned by taking 1% and 2% biochar with 0.01% and 0.02% silicon. The results have shown that treatment 8 (2% biochar and 0.02% silicon) exhibited maximum improvement in growth parameters along with improving the antioxidant defense system of Para grass. Application of treatment 8 also decreased Cd concentration in shoot and root by 48.8% and 47.4%, respectively. The treatment 8 was most effective in reducing CaCl2 extractable Cd in soil up to 56.1%. Based on this data, the treatment 8 was most effectual in suppressing Cd stress. Multiple sources of waste material can be considered for biochar production. Further, biochar in combination with other inorganic amendments can be tested for phyto-management of heavy metal contaminated soil and water.