Chateau is extremely photo-stable, meaning it will retain activity as it lays on the soil waiting for an activating rainfall or irrigation. Broad Spectrum Controls 90+ Annual Broadleaf and Grass Weeds.Long-Lasting Stays Where You Put It; Won't Leach or Co-distillate; No Photodegration. Weather-Ready Remains Active Until 1/4-Inch Rainfall or Irrigation Releases Its Activity. Read and Follow all Label Instructions. Chateau Herbicide SW - 2.5 Pounds. The item "Chateau SW Herbicide 2.5 Pounds By Valent (Group E 14 Herbicide)" is in sale since Friday, April 2, 2021. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Weed & Pest Control\Weed Control\Herbicides & Fungicides". The seller is "agpure" and is located in California. This item can be shipped to United States.