» This article's about the herbicidal formulation. For information on the herbicidal main active ingredient, see glyphosate. For other uses, see Round Up (disambiguation). | Section2 = | Section3 = }} Roundup's the brand name of a systemic, broad-spectrum herbicide produced by the U.S. company Monsanto and contains the active ingredient glyphosate. Glyphosate's the most used herbicide in the USA, and Roundup's the number one selling herbicide worldwide since at least 1980. Monsanto developed an… (More on Roundup)