Turf Tips Newsletter
Act now to prevent winter annual weeds
If your lawn was full of winter annual weeds this past spring, then now is the time to do something about preventing this from happening again this coming spring. Winter annual weeds, those that show up as young seedlings in the fall and become quite unsightly by mid-winter through spring, will be germinating soon.
A pre-emergence herbicide applied prior to their germination is the most effective and efficient way of control. Pre-emergence herbicides have little to no effect on weeds that have already germinated, so it is important to get the herbicide out soon (late August north to late September along the coast). A minimum of one-half inch of water either from rain or irrigation should follow shortly after the herbicide application to ensure that the herbicide is activated and moves it into the surface soil to form a uniform weed control barrier.
Pre-emergence herbicides may be purchased formulated as dry granules, wettable powders, or water dispersible granules, liquids, and coated on fertilizers. Choose a formulation that is best suited for you and ALWAYS READ THE LABEL for specific application instructions, weeds controlled, and safety precautions.
Extension publications #1532 and #1322 provide information to help select the appropriate herbicides for specific weeds.
Published August 18, 2008