Phytoremediation is the process in which plants remove pollutants from soils and water bodies. Depending on the plant species, pollutant type, and concentration of said pollutant, this process could take anywhere from 5 to 50 or more years. Petri Plot provides students with a web-accessible tool to be able to visualize and experiment with phytoremediative processes in planting design. Inspired by the petri dish (a clear container used in scientific studies to populate and observe changing fungi and bacteria), Petri Plot utilizes user-observation and interactivity as its primary means of educating them about this topic. This program was built using JavaScript, HTML, and CSS so that it could be hosted on the web and become a publicly accessible resource.