The study is aimed to provide rationalization to the Traditional claims of the Tagetes erectus leaf by phytochemical assessment and to investigate the active principle present in Tagetus erectus (compositae) commonly known as Marigold is an important plant which used to treat various diseases like Epilepsy, wound healing, antiinflammatory, anemia, etc. in indigenous system of medicine. Literature survey of the plant, Tagetes erectus revealed that the standardization, phytochemical study, and microscopic evaluation of the leaf part was not explored in depth, thus it was thought worthwhile to take up the work for its proper authentication and identification of the plant. Thus the present work embodies the investigations carried out to establish methods for quality control of drug, complete botanical evalution which comprises macroscopic, microscopic, physicochemical parameters like Ash value, Loss on drying, Extractive value to determine the active phytoconstutuents present in the extract. Thin Layer Chromatography, Total Phenolic Contents were also carried out for the investigation of active constituents and quality control of the drug.