Plant injury or death can occur. A weed-management system uses two or more control methods. Plant competition is an often overlooked tool and should be used first, but not exclusively. Unfortunately, too often herbicides are used to make up for poor cultural or mechanical management decisions. Herbicides may be a component of the weed-management system.
Biological controls can be part of a system.
Several natural enemies currently are available from the Colorado Department of Agriculture. Livestock grazing can be effective, depending on the weed species, and integrate with other methods. Mow monthly, starting at bolt to early bud-growth stage. Alternatively, till at three-week intervals. Tillage or mowing during the growing season sets up the weed for fall herbicide treatments.