The synthesis of silver nanoparticles from plant extract includes providing a solution including silver nitrate; providing an aqueous extract of the Abelmoschus esculentus (Okra) plant or plant part; mixing the silver nitrate solution and the extract solution to form an aqueous mixture; and resting the aqueous mixture for a period of time to form silver nanoparticles (AgNPs). The resulting silver nanoparticles demonstrate antimicrobial activity against both gram-positive and gram-negative pathogens.