Fertilome Weed Out Concentrate Lawn Weed Killer Contains Trimec Herbicide. Kills broadleaf weeds in your yard. Kills Dandelions, Poison Ivy and other broadleaf weeds in your yard. Two applications five days apart are needed for stubborn weeds like ground ivy, creeping charlie and violets. Will not harm northern or southern grasses when used as directed. Do not spray when temp is over 85 degrees. Do not seed for three to four weeks after spraying. Do not spray on new lawn until grass has been mowed three times. Do not spray trees, shrubs or flowers at Weed Out will kill anything with a broad leaf. Use Spreader Sticker with Weed Out. Best in a pump up sprayer. 1 Pint.