The Radish Party inquiry is designed to teach the importance and relevance of soil organic matter to young students. In this investigation, students grow radishes in three different kinds of soils: sand, sand plus nutrients, and potting soil (soil that includes organic matter). The experience described here was conducted with first- and second-grade students, but the investigation can be adapted for students at other grade levels as well. (Contains 1 figure, 4 resources and 4 online resources.)