Onion (Allium cepa), garlic (Allium sativum) and cinnamon (Cinnamomum zeylanicum) are edible herbs but they contain many chemical which can be used as medicine. Several human and plant diseases can be cured by these herbs. These herbs contain many molecules that are capable to inhibit or reduce growth of many types of microbes including bacteria responsible for disease in human, animals and plants. These are natural antibiotic used against many types of bacteria. With the development of resistant of bacteria against synthetic antibiotic now there is a need to have natural antibiotic which must be harmless, cheap and easily available. To know the measuring action of garlic, onion, and cinnamon on disease causing bacteria made extract of each sample in water and ethanol. In this study two methods were used. Antibacterial and antifungal potential of plant extracts were observed at two different stages (at the time of inoculation and after growth of pathogen on media). It was concluded that extract applied on bacteria before growth inhibit was maximum growth as compared to apply after growth and cinnamon extract in ethanol than onion and garlic effectively control bacterial growth. Extract dilute 100mg/ml to 0.01mg/ml minimum inhibitory concentration of extracts 33mg/ml under this concentration cinnamon extract stop growth of Xanthomonas compestris pv.malvacearum, Xanthomonas axonopodis pv.citri, Xanthomonas oryzae pv.oryzae garlic extract in water not resist the tested bacteria. As concentration decreases inhibition of bacteria also decreases. This study highlighted natural products ability to inhibit bacterial growth extended for other bacteria also helpful in medicinal field for further study.