Wilson WipeOut Ultra is a total herbicide that will kill any green and growing weed or grass on patios, driveways, sidewalks, along fences and more. Effective at temperatures as low as 15 �C. Plant damage will be visible from a few hours to two days after treaent. Avoid spraying desirable plants. Do not apply to mosses or algae in lawns. One application may last up to one year.