Marty from Merrick, Ny writes
With pre emergent hericides it is ALL about timing. While you may still be able to get some weed prevention by putting it down now, pre emergents when used in the spring need to be down well before soil temperatures reach 55 degrees. They can also be used in the fall for winter germinating weeds around September. Once weeds have started to come up only a post emergent product will control those as you see them. Surflan Pro Herbicide is a great pre emergent and should help with preventing most weeds in your yard.
Answer last updated on: 04/04/2017
