In line with research dedicated to new practices on organic matter, this chapter is based on an empirical study of entrepreneurial businesses, whose purpose is to collect and manage organic waste—mostly from food professionals and retailers. Composting businesses’ case leads to analyze one main paradox. While business creators highlight the intrinsic relationship between food-waste management and the defense of soil organic fertilization, yet they are waste composting professionals more than soil preservation and organic fertilization activists. How to understand the discrepancy between the issues of soil preservation lying in the background while food-waste composting practices are in the foreground? Despite this gap, how can business creators seize the soil conservation issue, and therefore challenge the prevalence of waste management over issues related to soil? I show in this chapter how the soil conservation cause and the food-waste composting cause compete and complete each other. In the first section, I will argue that the cause field is more structurally organized around waste than around soil. Despite this structural prevalence of waste, I will, in a second section, suggest that the more business creators practice composting, the more they learn and become aware of the soil conservation issue. Finally, I will highlight that the two companies offer two heterogenous—and unequally legitimated—interpretations of the cause.