Allelopathy is a biological process in which an organism produces bio-chemicals that influence the growth, survival, and reproduction of other organisms. Allelopathic interaction can be one of the most important variables influencing species distribution and abundance in plant communities, including weeds. These bio-chemicals known as allelochemicals can be beneficial or harmful to neighbouring organisms. Allelochemicals are designed to protect the organism and are thought to be important in the success of many weed species.