Policy makers can employ different instruments to address environmental policy objectives, and the guiding principles for a consistent system of environmental policy are (1) the policies should be effective, (2) there should be one objective per instrument, and (3) multiple objectives and multiple policy instruments must be mutually independent of each other. This paper evaluates these three principles for green public procurement (GPP). As an illustrative example, the analysis refers to the Swedish policy of using public purchase of organic foods as a policy instrument to increase the certified organic agricultural area as a share of the total agricultural area. Our analysis shows that GPP fails to satisfy principles (1) and (3), and the only way to satisfy principle (2) is then to have just one objective with the procurement, i.e., to run the operations. GPP might still have a positive environmental impact, but, if applied, the procuring authority has to be very specific with the one-to-one matching of criterion and objective.