IntroductionPlants exhibit exceptionally intelligent behavior when it comes to interactions with their environment. They can detect perceived threats and then transmit warning signals to other plants via chemical signals. The plants that have been warned will then gather their defenses against these potential threats, thus increasing their chances of survival and reproduction. Communication and competition are common phenomena in the plant world. Another brilliant, almost inconceivable ability that plants possess is the ability to recognize members of a family coexisting in their home range. These intelligent life forms realize that if members of a family compete less with each other in the allocation of their resources, their group will do better overall. This is a strategy used by many species, especially plants, to eliminate competition within their community in nature (Mancuso 2006). Competition can occur between members of the same species or different species. Affected individuals are negatively affected by other individuals who have the same living needs, such as food or space. Interspecific competition occurs when members of different species compete for a particular resource. Intraspecific competition occurs when members of the same species compete for a particular resource (Encyclopedia Britannica 2010). In this experiment we focus on interspecific competition. We measured the effect of competitor density on plant growth to observe the outcome of interspecific competition. In the first group (of two), our group used allelopathic ryegrass (Secale Cereals L.) as a competing species. In the second set, we used non-allelopathic oats (Avena fatua var. sativa) as our competitor's specification...... middle of paper ...... ass soil. This demonstrates that a pathogen can influence allelopathy between plants and that rust can enhance allelopathy of ryegrass against clover (Mattner 2001). Our results support the alternative hypothesis that density and weight of rye or oats (competing species) have a significant effect on 1/w of clover (indicator species) under normal conditions. This provides evidence that non-legumes win when in interspecific competition with a legume species and that allelopathic chemicals negatively affect indicator species during interspecific competition (Cain 2008). Errors that could have occurred when designing this experiment include possible uneven distribution of light, water, or temperature fluctuations. For future research, I would suggest observing the effects of allelopathy and symbiotic bacteria among different legume and non-legume species..