The effect of the Inhibition of germination and Seedling growth of red light and Chloramphenicol in helianthus. The light is one of them are negative photoblastic on germination percentage and Seedlings growth on sunflower observed the effect of red light and Chloramphenicol. Significant suppression of radical growth was also recorded is all cases the aromatic. Substance present in the rind may be responsible for the Inhibitary action.