Biochar, derived from chicken manure and green waste, was evaluated for its ability to immobilize heavy metals (Cd, Cu, Pb) and promote plant growth. The study used contaminated soils and found that biochar significantly reduced the extractable concentrations of Cd, Cu, and Pb, indicating metal immobilization. Chicken manure-derived biochar increased plant biomass by 353% and 572% for shoots and roots, respectively, with 1% biochar addition. This was attributed to reduced metal toxicity and increased nutrient availability. Both biochars reduced metal accumulation in Indian mustard, with reductions increasing with higher biochar application except for Cu. Metal fractionation data showed that biochar treatments shifted metals from easily exchangeable phases to less bioavailable organic-bound fractions. The results indicate that biochar application effectively reduces heavy metal bioavailability and phytotoxicity. Biochar, produced by low-temperature pyrolysis, has a porous structure and functional groups that enhance heavy metal adsorption. It can act as a soil conditioner and fertilizer, depending on its source. While biochar shows promise in metal immobilization, further research is needed to fully understand its effects on soil and plant systems. The study highlights the potential of biochar as an effective soil amendment for heavy metal remediation.Biochar, derived from chicken manure and green waste, was evaluated for its ability to immobilize heavy metals (Cd, Cu, Pb) and promote plant growth. The study used contaminated soils and found that biochar significantly reduced the extractable concentrations of Cd, Cu, and Pb, indicating metal immobilization. Chicken manure-derived biochar increased plant biomass by 353% and 572% for shoots and roots, respectively, with 1% biochar addition. This was attributed to reduced metal toxicity and increased nutrient availability. Both biochars reduced metal accumulation in Indian mustard, with reductions increasing with higher biochar application except for Cu. Metal fractionation data showed that biochar treatments shifted metals from easily exchangeable phases to less bioavailable organic-bound fractions. The results indicate that biochar application effectively reduces heavy metal bioavailability and phytotoxicity. Biochar, produced by low-temperature pyrolysis, has a porous structure and functional groups that enhance heavy metal adsorption. It can act as a soil conditioner and fertilizer, depending on its source. While biochar shows promise in metal immobilization, further research is needed to fully understand its effects on soil and plant systems. The study highlights the potential of biochar as an effective soil amendment for heavy metal remediation.