Mark from Mt. Vernon Illinois writes
Per the label, if you water your lawn or if it rains within 4 hours of an application of SpeedZone Lawn Weed Killer Concentrate it will reduce the effectiveness of the product. We usually recommend a window of 24 hours but after 12 hours if the area dried, it is still good and there's no need for you to apply again.
Answer last updated on: 03/29/2021