Abstract: Plants release many secondary metabolites to the environment that can be harnessed for important uses. These secondary metabolites are known as allelochemicals. The current worldwide demand for cheaper, more environmentally-friendly weed management technologies has motivated a number of studies on the allelopathic interaction between crops and weeds. Niger plant has been observed to have allelopathic effects on certain weeds. In order to evaluate the influence of Niger plant on selected weeds, an experiment was laid out in Randomized Complete Block Design (RCBD) with three replicates.