 But these products are contact weed killers. They're not preventatives. So then you just contact the weeds that you want to remove, and these products won't harm your lawn grass. Oh, perfect. Thank you. Thanks, Chase. Appreciate the phone call. 701-293-9000. Email studio at wdyradionow.com. Lawn and Garden Radio, Don Kinzer. Next few weeks he's going to be on the phone because he doesn't know how to read the instructions on a tree.