Compositions and method for killing unwanted plants using herbicidal compositions, which may in specific formulations include fatty acids and fatty acid esters as herbicidal agents and carriers for herbicidal agents, and in other embodiments include at least one ingredient selected from among fatty acids, soy, soybean oil, and silicone oil. Compositions of such type can be applied to areas containing both desired and undesired plants, to kill the undesired plants without harming the desired plants.
