The present investigation reports the variation in the ecophysiological attributes of some selected dominant weed species of Sarguja Division. Seeds of Cyperus iria, Cyperus flavidus, Echinochloa colona were collected from the fields of selected study sites and their eco-physiological attributes were studied. There was significant variation in various eco-physiological attributes of studied weed species. From the results it was found that highest reproductive output were reported by Cyperus iria. From percentage seed viability and germination percentage perspectives Echinochloa colona were found to be the major species to sustain in different study sites. Proper strategy should be implemented to control the population growth and spread of Echinochloa colona in the concerned study sites.